diff --git a/dist/pdf-viewer.component.js b/dist/pdf-viewer.component.js
index a9705e7d7..2a4f38041 100644
--- a/dist/pdf-viewer.component.js
+++ b/dist/pdf-viewer.component.js
@@ -27,7 +27,7 @@ var PdfViewerComponent = (function () {
         this.onError = new core_1.EventEmitter();
         this.onProgress = new core_1.EventEmitter();
         this.pageChange = new core_1.EventEmitter(true);
-        if (!isSSR()) {
+        if (!isSSR() && typeof PDFJS.workerSrc !== 'string') {
             PDFJS.workerSrc = "https://cdnjs.cloudflare.com/ajax/libs/pdf.js/" + PDFJS.version + "/pdf.worker.min.js";
         }
     }
@@ -304,6 +304,9 @@ var PdfViewerComponent = (function () {
     };
     PdfViewerComponent.prototype.getScale = function (viewportWidth) {
         var offsetWidth = this.element.nativeElement.offsetWidth;
+        if (offsetWidth === 0) {
+            return 1;
+        }
         return this._zoom * (offsetWidth / viewportWidth) / PdfViewerComponent.CSS_UNITS;
     };
     PdfViewerComponent.CSS_UNITS = 96.0 / 72.0;
diff --git a/package.json b/package.json
index c48f47ff3..490efed74 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "ng2-pdf-viewer",
-  "version": "3.0.3",
+  "version": "3.0.4",
   "description": "Angular2+ component for rendering PDF",
   "main": "dist/index.js",
   "typings": "./dist/index.d.ts",