no message

app/Http/Controllers/IndexController.php

@@ -14,7 +14,7 @@ use Redirect;
 class IndexController extends Controller
 {
 
-    private $version = '1.3.2';
+    private $version = '1.3.3';
 
     public function __invoke($method, $action = '', $child = '')
     {

resources/assets/statics/public/js/grapheditor/index.html

@@ -79,7 +79,7 @@
 
             graph.getModel().addListener(mxEvent.CHANGE, mxUtils.bind(editorUi, function() {
                 newXml = mxUtils.getPrettyXml(editorUi.editor.getGraphXml());
-                if (backupXml.replace(/^<mxGraphModel(.*?)>/, '') == newXml.replace(/^<mxGraphModel(.*?)>/, '')) {
+                if (backupXml && backupXml.replace(/^<mxGraphModel(.*?)>/, '') == newXml.replace(/^<mxGraphModel(.*?)>/, '')) {
                     return;
                 }
                 backupXml = newXml;