diff --git a/inc/optimus_cli.class.php b/inc/optimus_cli.class.php
index 1abbe86..16e9155 100644
--- a/inc/optimus_cli.class.php
+++ b/inc/optimus_cli.class.php
@@ -57,28 +57,28 @@ public static function optimize( $args, $assoc_args ) {
      * Checks if all the registered files really have the optimized version.
      * Note: only works with convert to webp is enabled.
      */
-    public static function syncMissing () {
-      $options = Optimus::get_options();
-      if ($options['webp_convert'] == 0) {
-        WP_CLI::error('sync-missing command only syncs webp missing images. Looks like you don\'t have this setting enabled.', TRUE);
-      }
-
-      // Retrieves the post ids with optimized assets registered in the DB.
-      $posts = Optimus_Management::bulk_optimized_assets();
-
-      foreach ($posts as $key => $post) {
-        $assets = Optimus_Request::get_files_paths($post['ID']);
-        foreach($assets as $asset_path) {
-          if (stream_resolve_include_path($asset_path) === FALSE) {
-            $metadata = wp_get_attachment_metadata($post['ID']);
-            // Unregister the optimus flags when the file is not longer there.
-            unset($metadata['optimus']);
-            update_post_meta($post['ID'], '_wp_attachment_metadata', $metadata);
-            // Registries works at post level.
-            break;
-          }
+    public static function syncMissingWebp () {
+        $options = Optimus::get_options();
+        if ($options['webp_convert'] == 0) {
+            WP_CLI::error('sync-missing command only syncs webp missing images. Looks like you don\'t have this setting enabled.', TRUE);
+        }
+
+        // Retrieves the post ids with optimized assets registered in the DB.
+        $posts = Optimus_Management::bulk_optimized_assets();
+
+        foreach ($posts as $key => $post) {
+            $assets = Optimus_Request::get_files_paths($post['ID']);
+            foreach($assets as $asset_path) {
+                if (stream_resolve_include_path($asset_path) === FALSE) {
+                    $metadata = wp_get_attachment_metadata($post['ID']);
+                    // Unregister the optimus flags when the file is not longer there.
+                    unset($metadata['optimus']);
+                    update_post_meta($post['ID'], '_wp_attachment_metadata', $metadata);
+                    // Registries works at post level.
+                    break;
+                }
+            }
         }
-      }
     }
 
     private static function _optimize_image($img) {
@@ -130,8 +130,8 @@ public static function add_commands() {
             ),
         ));
 
-        $cmd_syncmissing = function() { self::syncMissing(); };
-        WP_CLI::add_command( 'optimus sync-missing', $cmd_syncmissing, array(
+        $cmd_syncmissing = function() { self::syncMissingWebp(); };
+        WP_CLI::add_command( 'optimus webp sync', $cmd_syncmissing, array(
             'shortdesc' => 'Detects missing optimized assets.',
         ));
     }
diff --git a/inc/optimus_request.class.php b/inc/optimus_request.class.php
index 9263b34..6486a30 100644
--- a/inc/optimus_request.class.php
+++ b/inc/optimus_request.class.php
@@ -314,7 +314,9 @@ public static function optimize_upload_images($upload_data, $attachment_id) {
     * Gets all the files paths of the optimized images.
     */
     public static function get_files_paths($post_id) {
-       $metadata = wp_get_attachment_metadata($post_id);
+       if ( empty ( $metadata = wp_get_attachment_metadata( $post_id ) ) ) {
+         return array();
+       }
        $files = self::_get_files($metadata, $post_id);
        $post_files = array();