Ticket #24409: 24409-08.patch

src/wp-includes/js/media-models.js

@@ -448 +448 @@
                         }
 
                         size = this.attachment.get( 'sizes' )[ this.get( 'size' ) ];
+
+                        if ( ! size ) {
+                                return;
+                        }
+
                         this.set( 'url', size.url );
                         this.set( 'width', size.width );
                         this.set( 'height', size.height );