diff --git a/src/Umbraco.Web.UI.Client/src/common/services/navigation.service.js b/src/Umbraco.Web.UI.Client/src/common/services/navigation.service.js
index 20e73f9e06..f775e35934 100644
--- a/src/Umbraco.Web.UI.Client/src/common/services/navigation.service.js
+++ b/src/Umbraco.Web.UI.Client/src/common/services/navigation.service.js
@@ -288,9 +288,12 @@ function navigationService($rootScope, $routeParams, $log, $location, $q, $timeo
                 throw "args.tree cannot be null";
             }
 
-            if (mainTreeEventHandler) {
-                //returns a promise
-                return mainTreeEventHandler.syncTree(args);
+            if (mainTreeEventHandler) {                
+               
+                if (mainTreeEventHandler.syncTree) {
+                    //returns a promise,
+                    return mainTreeEventHandler.syncTree(args);
+                }
             }
 
             //couldn't sync