Error was "Error loading this resource". See: https://github.com/johndyer/mediaelement/issues/1769
@@ -9,6 +9,10 @@ CKEDITOR.dialog.add( 'video', function ( editor )
if ( !value && this.id=='id' )
value = generateId();
+ if (value == '') {
+ return;
+ }
+
videoNode.setAttribute( this.id, value);
if ( !value )