diff --git a/CHANGELOG.md b/CHANGELOG.md
index daeabe5..0f51e9a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## [1.0.0] - (2021-Feb-19)
+
+* Adds null safety.  Closes [#127](https://github.com/jonbhanson/flutter_native_splash/issues/127).
+
 ## [0.3.0] - (2021-Feb-10)
 
 * Added support for web.  Closes [#30](https://github.com/jonbhanson/flutter_native_splash/issues/30).
diff --git a/README.md b/README.md
index c65fa35..7ad5f3c 100644
--- a/README.md
+++ b/README.md
@@ -13,7 +13,7 @@ First, add `flutter_native_splash` as a dev dependency in your pubspec.yaml file
 
 ```yaml
 dev_dependencies:
-  flutter_native_splash: ^0.3.0
+  flutter_native_splash: ^1.0.0
 ```
 
 Don't forget to `flutter pub get`.
@@ -105,6 +105,7 @@ class MyApp extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return FutureBuilder(
+      // Replace the 3 second delay with your initialization code:
       future: Future.delayed(Duration(seconds: 3)),
       builder: (context, AsyncSnapshot snapshot) {
         // Show splash screen while waiting for app resources to load:
@@ -153,7 +154,7 @@ Not at this time.  However, you may want to consider a secondary splash screen t
 # Notes
 * If splash screen was not updated properly on iOS or if you experience a white screen before splash screen, run `flutter clean` and recompile your app. If that does not solve the problem, delete your app from the device, power down the device, power up device, install and launch app as per [this stackoverflow thread](https://stackoverflow.com/questions/33002829/ios-keeping-old-launch-screen-and-app-icon-after-update).
 
-* This package modifies `launch_background.xml`, and `styles.xml` files on Android and `LaunchScreen.storyboard`, and `Info.plist` on iOS. If you modified this files manually this plugin may not work properly, please [open an issue](https://github.com//jonbhanson/flutter_native_splash/issues/new?template=bug_report.md) if you find any bugs.
+* This package modifies `launch_background.xml` and `styles.xml` files on Android, `LaunchScreen.storyboard` and `Info.plist` on iOS, and `index.html` on Web. If you have modified these files manually, this plugin may not work properly. Please [open an issue](https://github.com//jonbhanson/flutter_native_splash/issues/new?template=bug_report.md) if you find any bugs.
 
 # How it works
 ## Android
diff --git a/example/pubspec.yaml b/example/pubspec.yaml
index bb01938..fa369a4 100644
--- a/example/pubspec.yaml
+++ b/example/pubspec.yaml
@@ -18,7 +18,7 @@ publish_to: 'none' # Remove this line if you wish to publish to pub.dev
 version: 1.0.0+1
 
 environment:
-  sdk: ">=2.7.0 <3.0.0"
+  sdk: '>=2.12.0-0 <3.0.0'
 
 dependencies:
   flutter:
diff --git a/lib/android.dart b/lib/android.dart
index 381f5a7..e81dd9b 100644
--- a/lib/android.dart
+++ b/lib/android.dart
@@ -4,7 +4,8 @@ part of flutter_native_splash_supported_platform;
 class _AndroidDrawableTemplate {
   final String directoryName;
   final double divider;
-  _AndroidDrawableTemplate({this.directoryName, this.divider});
+  _AndroidDrawableTemplate(
+      {required this.directoryName, required this.divider});
 }
 
 final List<_AndroidDrawableTemplate> _splashImages = <_AndroidDrawableTemplate>[
@@ -27,13 +28,13 @@ final List<_AndroidDrawableTemplate> _splashImagesDark =
 ];
 
 /// Create Android splash screen
-void _createAndroidSplash(
-    {String imagePath,
-    String darkImagePath,
-    String color,
-    String darkColor,
-    String gravity,
-    bool fullscreen}) async {
+Future<void> _createAndroidSplash(
+    {required String imagePath,
+    required String darkImagePath,
+    required String color,
+    required String darkColor,
+    required String gravity,
+    required bool fullscreen}) async {
   if (imagePath.isNotEmpty) {
     await _applyImageAndroid(imagePath: imagePath);
   }
@@ -87,7 +88,8 @@ void _createAndroidSplash(
 }
 
 /// Create splash screen as drawables for multiple screens (dpi)
-void _applyImageAndroid({String imagePath, bool dark = false}) {
+Future<void> _applyImageAndroid(
+    {required String imagePath, bool dark = false}) async {
   print('[Android] Creating ' + (dark ? 'dark mode ' : '') + 'splash images');
 
   final file = File(imagePath);
@@ -97,6 +99,9 @@ void _applyImageAndroid({String imagePath, bool dark = false}) {
   }
 
   final image = decodeImage(File(imagePath).readAsBytesSync());
+  if (image == null) {
+    throw _NoImageFileFoundException('The file $imagePath could not be read.');
+  }
 
   for (var template in dark ? _splashImagesDark : _splashImages) {
     _saveImageAndroid(template: template, image: image);
@@ -106,7 +111,8 @@ void _applyImageAndroid({String imagePath, bool dark = false}) {
 /// Saves splash screen image to the project
 /// Note: Do not change interpolation unless you end up with better results
 /// https://github.com/fluttercommunity/flutter_launcher_icons/issues/101#issuecomment-495528733
-void _saveImageAndroid({_AndroidDrawableTemplate template, Image image}) {
+void _saveImageAndroid(
+    {required _AndroidDrawableTemplate template, required Image image}) {
   var newFile = copyResize(
     image,
     width: image.width ~/ template.divider,
@@ -123,9 +129,9 @@ void _saveImageAndroid({_AndroidDrawableTemplate template, Image image}) {
 
 /// Create or update launch_background.xml adding splash image path
 Future _applyLaunchBackgroundXml({
-  String gravity,
-  String launchBackgroundFilePath,
-  bool showImage,
+  required String gravity,
+  required String launchBackgroundFilePath,
+  required bool showImage,
 }) {
   final launchBackgroundFile = File(launchBackgroundFilePath);
 
@@ -157,7 +163,9 @@ Future _applyLaunchBackgroundXml({
 
 /// Updates launch_background.xml adding splash image path
 Future _updateLaunchBackgroundFileWithImagePath(
-    {String launchBackgroundFilePath, String gravity, bool showImage}) async {
+    {required String launchBackgroundFilePath,
+    required String gravity,
+    required bool showImage}) async {
   final launchBackgroundFile = File(launchBackgroundFilePath);
   var launchBackgroundDocument;
   if (launchBackgroundFile.existsSync()) {
@@ -190,7 +198,7 @@ Future _updateLaunchBackgroundFileWithImagePath(
   if (showImage) {
     var splashItem =
         XmlDocument.parse(_androidLaunchBackgroundItemXml).rootElement.copy();
-    splashItem.getElement('bitmap').setAttribute('android:gravity', gravity);
+    splashItem.getElement('bitmap')?.setAttribute('android:gravity', gravity);
     items.add(splashItem);
   }
   launchBackgroundFile.writeAsStringSync(
@@ -199,22 +207,24 @@ Future _updateLaunchBackgroundFileWithImagePath(
 
 /// Creates launch_background.xml with splash image path
 Future _createLaunchBackgroundFileWithImagePath(
-    {String gravity, String launchBackgroundFilePath, bool showImage}) async {
+    {required String gravity,
+    required String launchBackgroundFilePath,
+    required bool showImage}) async {
   var file = await File(launchBackgroundFilePath).create(recursive: true);
   var fileContent = XmlDocument.parse(_androidLaunchBackgroundXml);
 
   if (showImage) {
     var splashItem =
         XmlDocument.parse(_androidLaunchBackgroundItemXml).rootElement.copy();
-    splashItem.getElement('bitmap').setAttribute('android:gravity', gravity);
-    fileContent.getElement('layer-list').children.add(splashItem);
+    splashItem.getElement('bitmap')?.setAttribute('android:gravity', gravity);
+    fileContent.getElement('layer-list')?.children.add(splashItem);
   }
   return await file
       .writeAsString(fileContent.toXmlString(pretty: true, indent: '    '));
 }
 
 /// Create or update colors.xml adding splash screen background color
-Future<void> _applyColor({color, String colorFile}) async {
+Future<void> _applyColor({color, required String colorFile}) async {
   var colorsXml = File(colorFile);
 
   color = '#' + color;
@@ -233,7 +243,8 @@ Future<void> _applyColor({color, String colorFile}) async {
 }
 
 /// Updates the colors.xml with the splash screen background color
-void _updateColorsFileWithColor({File colorsFile, String color}) {
+void _updateColorsFileWithColor(
+    {required File colorsFile, required String color}) {
   final lines = colorsFile.readAsLinesSync();
   var foundExisting = false;
 
@@ -264,7 +275,7 @@ void _updateColorsFileWithColor({File colorsFile, String color}) {
 }
 
 /// Creates a colors.xml file if it was missing from android/app/src/main/res/values/colors.xml
-void _createColorsFile({String color, File colorsXml}) {
+void _createColorsFile({required String color, required File colorsXml}) {
   colorsXml.create(recursive: true).then((File colorsFile) {
     colorsFile.writeAsString(_androidColorsXml).then((File file) {
       _updateColorsFileWithColor(colorsFile: colorsFile, color: color);
@@ -277,7 +288,7 @@ void _createColorsFile({String color, File colorsXml}) {
 ///
 /// Note: default color = "splash_color"
 Future _overwriteLaunchBackgroundWithNewSplashColor(
-    {String color, String launchBackgroundFilePath}) async {
+    {required String color, required String launchBackgroundFilePath}) async {
   final launchBackgroundFile = File(launchBackgroundFilePath);
   final lines = await launchBackgroundFile.readAsLines();
 
@@ -302,7 +313,7 @@ Future _overwriteLaunchBackgroundWithNewSplashColor(
 }
 
 /// Create or update styles.xml full screen mode setting
-Future<void> _applyStylesXml({bool fullScreen}) async {
+Future<void> _applyStylesXml({required bool fullScreen}) async {
   final stylesFile = File(_androidStylesFile);
 
   if (!stylesFile.existsSync()) {
@@ -316,7 +327,8 @@ Future<void> _applyStylesXml({bool fullScreen}) async {
 }
 
 /// Updates styles.xml adding full screen property
-Future<void> _updateStylesFile({bool fullScreen, File stylesFile}) async {
+Future<void> _updateStylesFile(
+    {required bool fullScreen, required File stylesFile}) async {
   final stylesDocument = XmlDocument.parse(await stylesFile.readAsString());
   final styles = stylesDocument.findAllElements('style');
   if (styles.length == 1) {
@@ -325,19 +337,24 @@ Future<void> _updateStylesFile({bool fullScreen, File stylesFile}) async {
         'embedding.  Skipping update of styles.xml with fullscreen mode');
     return;
   }
+  var found = true;
   final launchTheme = styles.firstWhere(
       (element) => (element.attributes.any((attribute) =>
           attribute.name.toString() == 'name' &&
-          attribute.value == 'LaunchTheme')),
-      orElse: () => null);
-  if (launchTheme != null) {
+          attribute.value == 'LaunchTheme')), orElse: () {
+    found = false;
+    return XmlElement(XmlName('dummy'));
+  });
+  if (found) {
     final fullScreenElement = launchTheme.children.firstWhere(
         (element) => (element.attributes.any((attribute) {
               return attribute.name.toString() == 'name' &&
                   attribute.value == 'android:windowFullscreen';
-            })),
-        orElse: () => null);
-    if (fullScreenElement == null) {
+            })), orElse: () {
+      found = false;
+      return XmlElement(XmlName('dummy'));
+    });
+    if (found) {
       launchTheme.children.add(XmlElement(
           XmlName('item'),
           [XmlAttribute(XmlName('name'), 'android:windowFullscreen')],
@@ -354,7 +371,7 @@ Future<void> _updateStylesFile({bool fullScreen, File stylesFile}) async {
 }
 
 /// Creates styles.xml with full screen property
-void _createStylesFileWithImagePath({File stylesFile}) {
+void _createStylesFileWithImagePath({required File stylesFile}) {
   stylesFile.createSync(recursive: true);
   stylesFile.writeAsStringSync(_androidStylesXml);
 }
diff --git a/lib/exceptions.dart b/lib/exceptions.dart
index 76d1f3a..c623698 100644
--- a/lib/exceptions.dart
+++ b/lib/exceptions.dart
@@ -1,7 +1,7 @@
 part of flutter_native_splash_supported_platform;
 
 class _NoConfigFoundException implements Exception {
-  const _NoConfigFoundException([this.message]);
+  const _NoConfigFoundException(this.message);
   final String message;
 
   @override
@@ -13,7 +13,7 @@ class _NoConfigFoundException implements Exception {
 }
 
 class _InvalidConfigException implements Exception {
-  const _InvalidConfigException([this.message]);
+  const _InvalidConfigException(this.message);
   final String message;
 
   @override
@@ -25,7 +25,7 @@ class _InvalidConfigException implements Exception {
 }
 
 class _NoImageFileFoundException implements Exception {
-  const _NoImageFileFoundException([this.message]);
+  const _NoImageFileFoundException(this.message);
   final String message;
 
   @override
@@ -37,7 +37,7 @@ class _NoImageFileFoundException implements Exception {
 }
 
 class _InvalidNativeFile implements Exception {
-  const _InvalidNativeFile([this.message]);
+  const _InvalidNativeFile(this.message);
   final String message;
 
   @override
@@ -49,7 +49,7 @@ class _InvalidNativeFile implements Exception {
 }
 
 class _LaunchScreenStoryboardModified implements Exception {
-  const _LaunchScreenStoryboardModified([this.message]);
+  const _LaunchScreenStoryboardModified(this.message);
   final String message;
 
   @override
@@ -61,7 +61,7 @@ class _LaunchScreenStoryboardModified implements Exception {
 }
 
 class _CantFindInfoPlistFile implements Exception {
-  const _CantFindInfoPlistFile([this.message]);
+  const _CantFindInfoPlistFile(this.message);
   final String message;
 
   @override
diff --git a/lib/ios.dart b/lib/ios.dart
index 9c1bd48..39177f0 100644
--- a/lib/ios.dart
+++ b/lib/ios.dart
@@ -5,7 +5,7 @@ class _IosLaunchImageTemplate {
   final String fileName;
   final double divider;
 
-  _IosLaunchImageTemplate({this.fileName, this.divider});
+  _IosLaunchImageTemplate({required this.fileName, required this.divider});
 }
 
 final List<_IosLaunchImageTemplate> _iOSSplashImages =
@@ -25,14 +25,14 @@ final List<_IosLaunchImageTemplate> _iOSSplashImagesDark =
 ];
 
 /// Create iOS splash screen
-void _createiOSSplash({
-  String imagePath,
-  String darkImagePath,
-  String color,
-  String darkColor,
-  List<String> plistFiles,
-  String iosContentMode,
-  bool fullscreen,
+Future<void> _createiOSSplash({
+  required String imagePath,
+  required String darkImagePath,
+  required String color,
+  required String darkColor,
+  List<String>? plistFiles,
+  required String iosContentMode,
+  required bool fullscreen,
 }) async {
   if (imagePath.isNotEmpty) {
     await _applyImageiOS(imagePath: imagePath);
@@ -70,20 +70,25 @@ void _createiOSSplash({
 }
 
 /// Create splash screen images for original size, @2x and @3x
-void _applyImageiOS({String imagePath, bool dark = false}) {
+Future<void> _applyImageiOS(
+    {required String imagePath, bool dark = false}) async {
   print('[iOS] Creating ' + (dark ? 'dark mode ' : '') + 'splash images');
   if (!File(imagePath).existsSync()) {
     throw _NoImageFileFoundException('The file $imagePath was not found.');
   }
 
   final image = decodeImage(File(imagePath).readAsBytesSync());
+  if (image == null) {
+    throw _NoImageFileFoundException(imagePath + ' could not be loaded.');
+  }
   for (var template in dark ? _iOSSplashImagesDark : _iOSSplashImages) {
     _saveImageiOS(template: template, image: image);
   }
 }
 
 /// Saves splash screen image to the project
-void _saveImageiOS({_IosLaunchImageTemplate template, Image image}) {
+void _saveImageiOS(
+    {required _IosLaunchImageTemplate template, required Image image}) {
   var newFile = copyResize(
     image,
     width: image.width ~/ template.divider,
@@ -99,7 +104,8 @@ void _saveImageiOS({_IosLaunchImageTemplate template, Image image}) {
 }
 
 /// Update LaunchScreen.storyboard adding width, height and color
-Future _applyLaunchScreenStoryboard({String imagePath, String iosContentMode}) {
+Future _applyLaunchScreenStoryboard(
+    {required String imagePath, required String iosContentMode}) {
   final file = File(_iOSLaunchScreenStoryboardFile);
 
   if (file.existsSync()) {
@@ -117,7 +123,7 @@ Future _applyLaunchScreenStoryboard({String imagePath, String iosContentMode}) {
 
 /// Updates LaunchScreen.storyboard adding splash image path
 Future _updateLaunchScreenStoryboard(
-    {String imagePath, String iosContentMode}) async {
+    {required String imagePath, required String iosContentMode}) async {
   // Load the data
   final file = File(_iOSLaunchScreenStoryboardFile);
   final xmlDocument = XmlDocument.parse(file.readAsStringSync());
@@ -125,7 +131,7 @@ Future _updateLaunchScreenStoryboard(
 
   // Find the view that contains the splash image
   final view =
-      documentData.descendants.whereType<XmlElement>().firstWhere((element) {
+      documentData?.descendants.whereType<XmlElement>().firstWhere((element) {
     return (element.name.qualified == 'view' &&
         element.getAttribute('id') == 'Ze5-6b-2t3');
   });
@@ -136,47 +142,37 @@ Future _updateLaunchScreenStoryboard(
 
   // Find the splash imageView
   final subViews = view.getElement('subviews');
-  final imageView = subViews.children.whereType<XmlElement>().firstWhere(
+  final imageView = subViews?.children.whereType<XmlElement>().firstWhere(
       (element) => (element.name.qualified == 'imageView' &&
           element.getAttribute('image') == 'LaunchImage'));
-  final backgroundView = subViews.children.whereType<XmlElement>().firstWhere(
+  subViews?.children.whereType<XmlElement>().firstWhere(
       (element) => (element.name.qualified == 'imageView' &&
-          element.getAttribute('image') == 'LaunchBackground'),
-      orElse: () => null);
+          element.getAttribute('image') == 'LaunchBackground'), orElse: () {
+    subViews.children.insert(
+        0, XmlDocument.parse(_iOSLaunchBackgroundSubview).rootElement.copy());
+    return XmlElement(XmlName(''));
+  });
   // Update the fill property
-  imageView.setAttribute('contentMode', iosContentMode);
+  imageView?.setAttribute('contentMode', iosContentMode);
 
   // Find the resources
-  final resources = documentData.getElement('resources');
-  var launchImageResource = resources.children
-      .whereType<XmlElement>()
-      .firstWhere(
-          (element) => (element.name.qualified == 'image' &&
-              element.getAttribute('name') == 'LaunchImage'),
-          orElse: () => null);
-  if (launchImageResource == null) {
-    throw _LaunchScreenStoryboardModified(
-        "Not able to find 'LaunchImage' image tag in LaunchScreen.storyboard. Image for splash screen not updated. Did you modify your default LaunchScreen.storyboard file?");
-  }
-  final launchBackgroundResource = resources.children
-      .whereType<XmlElement>()
-      .firstWhere(
-          (element) => (element.name.qualified == 'image' &&
-              element.getAttribute('name') == 'LaunchBackground'),
-          orElse: () => null);
-
-  // If the color has not been set via background image, set it here:
-  if (launchBackgroundResource == null) {
+  final resources = documentData?.getElement('resources');
+  var launchImageResource = resources?.children.whereType<XmlElement>().firstWhere(
+      (element) => (element.name.qualified == 'image' &&
+          element.getAttribute('name') == 'LaunchImage'),
+      orElse: () => throw _LaunchScreenStoryboardModified(
+          "Not able to find 'LaunchImage' image tag in LaunchScreen.storyboard. Image for splash screen not updated. Did you modify your default LaunchScreen.storyboard file?"));
+
+  resources?.children.whereType<XmlElement>().firstWhere(
+      (element) => (element.name.qualified == 'image' &&
+          element.getAttribute('name') == 'LaunchBackground'), orElse: () {
+    // If the color has not been set via background image, set it here:
     resources.children.add(XmlDocument.parse(
             '<image name="LaunchBackground" width="1" height="1"/>')
         .rootElement
         .copy());
-  }
-
-  if (backgroundView == null) {
-    subViews.children.insert(
-        0, XmlDocument.parse(_iOSLaunchBackgroundSubview).rootElement.copy());
-  }
+    return XmlElement(XmlName(''));
+  });
 
   view.children.remove(view.getElement('constraints'));
   view.children.add(
@@ -188,8 +184,11 @@ Future _updateLaunchScreenStoryboard(
     }
 
     final image = decodeImage(File(imagePath).readAsBytesSync());
-    launchImageResource.setAttribute('width', image.width.toString());
-    launchImageResource.setAttribute('height', image.height.toString());
+    if (image == null) {
+      throw _NoImageFileFoundException(imagePath + ' could not be loaded.');
+    }
+    launchImageResource?.setAttribute('width', image.width.toString());
+    launchImageResource?.setAttribute('height', image.height.toString());
   }
 
   file.writeAsStringSync(xmlDocument.toXmlString(pretty: true, indent: '    '));
@@ -197,7 +196,7 @@ Future _updateLaunchScreenStoryboard(
 
 /// Creates LaunchScreen.storyboard with splash image path
 Future _createLaunchScreenStoryboard(
-    {String imagePath, String iosContentMode}) async {
+    {required String imagePath, required String iosContentMode}) async {
   var file = await File(_iOSLaunchScreenStoryboardFile).create(recursive: true);
   await file.writeAsString(_iOSLaunchScreenStoryboardContent);
   return _updateLaunchScreenStoryboard(
@@ -205,7 +204,7 @@ Future _createLaunchScreenStoryboard(
 }
 
 Future<void> _createBackgroundColor(
-    {String colorString, String darkColorString}) async {
+    {required String colorString, required String darkColorString}) async {
   var background = Image(1, 1);
   var redChannel = int.parse(colorString.substring(0, 2), radix: 16);
   var greenChannel = int.parse(colorString.substring(2, 4), radix: 16);
@@ -241,7 +240,8 @@ Future<void> _createBackgroundColor(
 }
 
 /// Update Info.plist for status bar behaviour (hidden/visible)
-Future _applyInfoPList({List<String> plistFiles, bool fullscreen}) async {
+Future _applyInfoPList(
+    {List<String>? plistFiles, required bool fullscreen}) async {
   if (plistFiles == null) {
     plistFiles = [];
     plistFiles.add(_iOSInfoPlistFile);
@@ -261,12 +261,17 @@ Future _applyInfoPList({List<String> plistFiles, bool fullscreen}) async {
 }
 
 /// Update Infop.list with status bar hidden directive
-Future _updateInfoPlistFile({String plistFile, bool fullscreen}) async {
+Future _updateInfoPlistFile(
+    {required String plistFile, required bool fullscreen}) async {
   // Load the data
   final file = File(plistFile);
   final xmlDocument = XmlDocument.parse(file.readAsStringSync());
-  final dict = xmlDocument.getElement('plist').getElement('dict');
+  final dict = xmlDocument.getElement('plist')?.getElement('dict');
+  if (dict == null) {
+    throw Exception(plistFile + ' plist dict element not found');
+  }
 
+  var elementFound = true;
   final uIStatusBarHidden =
       dict.children.whereType<XmlElement>().firstWhere((element) {
     return (element.text == 'UIStatusBarHidden');
@@ -277,16 +282,18 @@ Future _updateInfoPlistFile({String plistFile, bool fullscreen}) async {
     });
     dict.children.add(builder.buildFragment());
     dict.children.add(XmlElement(XmlName(fullscreen.toString())));
-    return null;
+    elementFound = false;
+    return XmlElement(XmlName(''));
   });
 
-  if (uIStatusBarHidden != null) {
+  if (elementFound) {
     var index = dict.children.indexOf(uIStatusBarHidden);
     var uIStatusBarHiddenValue = dict.children[index + 1].following
         .firstWhere((element) => element.nodeType == XmlNodeType.ELEMENT);
     uIStatusBarHiddenValue.replace(XmlElement(XmlName(fullscreen.toString())));
   }
 
+  elementFound = true;
   if (fullscreen) {
     final uIViewControllerBasedStatusBarAppearance =
         dict.children.whereType<XmlElement>().firstWhere((element) {
@@ -298,10 +305,11 @@ Future _updateInfoPlistFile({String plistFile, bool fullscreen}) async {
       });
       dict.children.add(builder.buildFragment());
       dict.children.add(XmlElement(XmlName((!fullscreen).toString())));
-      return null;
+      elementFound = false;
+      return XmlElement(XmlName(''));
     });
 
-    if (uIViewControllerBasedStatusBarAppearance != null) {
+    if (elementFound) {
       var index =
           dict.children.indexOf(uIViewControllerBasedStatusBarAppearance);
 
diff --git a/lib/supported_platform.dart b/lib/supported_platform.dart
index 8c0d5e3..2153b58 100644
--- a/lib/supported_platform.dart
+++ b/lib/supported_platform.dart
@@ -38,7 +38,7 @@ Future<void> tryCreateSplashByConfig(Map<String, dynamic> config) async {
   String image = config['image'] ?? '';
   String darkImage = config['image_dark'] ?? '';
   var color = _parseColor(config['color']);
-  var darkColor = _parseColor(config['color_dark']) ?? '';
+  var darkColor = _parseColor(config['color_dark']);
   var plistFiles = config['info_plist_files'];
   var gravity = (config['fill'] ?? false) ? 'fill' : 'center';
   if (config['android_gravity'] != null) gravity = config['android_gravity'];
@@ -86,7 +86,7 @@ String _parseColor(var color) {
     color = color.replaceAll('#', '').replaceAll(' ', '');
     if (color.length == 6) return color;
   }
-  if (color == null) return null;
+  if (color == null) return '';
 
   throw Exception('Invalid color value');
 }
@@ -103,19 +103,23 @@ Map<String, dynamic> _getConfig() {
   final yamlString = file.readAsStringSync();
   final Map yamlMap = loadYaml(yamlString);
 
-  if (yamlMap == null || !(yamlMap['flutter_native_splash'] is Map)) {
+  if (!(yamlMap['flutter_native_splash'] is Map)) {
     stderr.writeln(_NoConfigFoundException(
         'Your `$filePath` file does not contain a `flutter_native_splash` section.'));
     exit(1);
   }
 
-  // yamlMap has the type YamlMap, which has several unwanted sideeffects
+  // yamlMap has the type YamlMap, which has several unwanted side effects
   final config = <String, dynamic>{};
   for (MapEntry<dynamic, dynamic> entry
       in yamlMap['flutter_native_splash'].entries) {
     if (entry.value is YamlList) {
       var list = <String>[];
-      (entry.value as YamlList).forEach(list.add);
+      (entry.value as YamlList).forEach((dynamic value) {
+        if (value is String) {
+          list.add(value);
+        }
+      });
       config[entry.key] = list;
     } else {
       config[entry.key] = entry.value;
diff --git a/lib/unsupported_platform.dart b/lib/unsupported_platform.dart
index 6e01532..b9d2020 100644
--- a/lib/unsupported_platform.dart
+++ b/lib/unsupported_platform.dart
@@ -15,7 +15,7 @@ void tryCreateSplashByConfig(Map<String, dynamic> config) async {
 }
 
 /// Function that will be called on unsupported platforms, triggering exception.
-void tryCreateSplash() async {
+Future<void> tryCreateSplash() async {
   throw UnsupportedError(
       'This package requires dart:io, which is unsupported by this platform.');
 }
diff --git a/lib/web.dart b/lib/web.dart
index 6f0caae..3a846ca 100644
--- a/lib/web.dart
+++ b/lib/web.dart
@@ -4,16 +4,16 @@ part of flutter_native_splash_supported_platform;
 class _WebLaunchImageTemplate {
   final String fileName;
   final double divider;
-  _WebLaunchImageTemplate({this.fileName, this.divider});
+  _WebLaunchImageTemplate({required this.fileName, required this.divider});
 }
 
 /// Create Android splash screen
 Future<void> _createWebSplash({
-  String imagePath,
-  String darkImagePath,
-  String color,
-  String darkColor,
-  String imageMode,
+  required String imagePath,
+  required String darkImagePath,
+  required String color,
+  required String darkColor,
+  required String imageMode,
 }) async {
   if (!File(_webIndex).existsSync()) {
     print('[Web] ' + _webIndex + ' not found.  Skipping Web.');
@@ -35,8 +35,9 @@ Future<void> _createWebSplash({
   await updateIndex(imageMode: imageMode, showImages: imagePath.isNotEmpty);
 }
 
-void createWebImages(
-    {String imagePath, List<_WebLaunchImageTemplate> webSplashImages}) async {
+Future<void> createWebImages(
+    {required String imagePath,
+    required List<_WebLaunchImageTemplate> webSplashImages}) async {
   if (imagePath.isEmpty) {
     for (var template in webSplashImages) {
       final file = File(_webSplashImagesFolder + template.fileName);
@@ -44,6 +45,9 @@ void createWebImages(
     }
   } else {
     final image = decodeImage(File(imagePath).readAsBytesSync());
+    if (image == null) {
+      throw _NoImageFileFoundException(imagePath + ' could not be read');
+    }
     print('[Web] Creating images');
     for (var template in webSplashImages) {
       await _saveImageWeb(template: template, image: image);
@@ -51,7 +55,8 @@ void createWebImages(
   }
 }
 
-dynamic _saveImageWeb({_WebLaunchImageTemplate template, Image image}) async {
+dynamic _saveImageWeb(
+    {required _WebLaunchImageTemplate template, required Image image}) async {
   var newFile = await copyResize(
     image,
     width: image.width ~/ template.divider,
@@ -64,7 +69,8 @@ dynamic _saveImageWeb({_WebLaunchImageTemplate template, Image image}) async {
   await file.writeAsBytes(encodePng(newFile));
 }
 
-void createSplashCss({String color, String darkColor}) {
+Future<void> createSplashCss(
+    {required String color, required String darkColor}) async {
   print('[Web] Creating CSS');
   if (darkColor.isEmpty) darkColor = color;
   var cssContent = _webCss
@@ -73,7 +79,8 @@ void createSplashCss({String color, String darkColor}) {
   File(_webFolder + _webRelativeStyleFile).writeAsStringSync(cssContent);
 }
 
-void updateIndex({String imageMode, bool showImages}) async {
+Future<void> updateIndex(
+    {required String imageMode, required bool showImages}) async {
   print('[Web] Updating index.html');
   final webIndex = File(_webIndex);
   var lines = webIndex.readAsLinesSync();
diff --git a/pubspec.lock b/pubspec.lock
index ff913ec..83412d6 100644
--- a/pubspec.lock
+++ b/pubspec.lock
@@ -7,14 +7,7 @@ packages:
       name: archive
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.0.13"
-  args:
-    dependency: transitive
-    description:
-      name: args
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "1.6.0"
+    version: "3.0.0"
   charcode:
     dependency: transitive
     description:
@@ -29,27 +22,20 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.15.0"
-  convert:
-    dependency: transitive
-    description:
-      name: convert
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "2.1.1"
   crypto:
     dependency: transitive
     description:
       name: crypto
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.1.5"
+    version: "3.0.0"
   image:
     dependency: "direct main"
     description:
       name: image
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.1.19"
+    version: "3.0.0-nullsafety.0"
   meta:
     dependency: transitive
     description:
@@ -77,7 +63,7 @@ packages:
       name: petitparser
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "3.1.0"
+    version: "4.0.2"
   source_span:
     dependency: transitive
     description:
@@ -112,13 +98,13 @@ packages:
       name: xml
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "4.5.1"
+    version: "5.0.2"
   yaml:
     dependency: "direct main"
     description:
       name: yaml
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.2.1"
+    version: "3.0.0"
 sdks:
   dart: ">=2.12.0-0.0 <3.0.0"
diff --git a/pubspec.yaml b/pubspec.yaml
index 25dea8e..aa7da72 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,15 +1,15 @@
 name: flutter_native_splash
 description: Generates native code to customize Flutter's default white native splash screen with background color and splash image. Supports dark mode, full screen, and more.
-version: 0.3.0
+version: 1.0.0
 homepage: https://github.com/jonbhanson/flutter_native_splash
 
 environment:
-  sdk: ">=2.2.0 <3.0.0"
+  sdk: '>=2.12.0-0 <3.0.0'
 
 dependencies:
-  yaml: ^2.2.1
-  image: ^2.1.19
-  xml: ^4.5.1
+  yaml: ^3.0.0
+  image: ^3.0.0-nullsafety.0
+  xml: ^5.0.2
 
 dev_dependencies:
-  pedantic: ^1.9.2
+  pedantic: ^1.10.0