diff --git a/wise-webapp/src/main/java/com/wisemapping/webmvc/MindmapController.java b/wise-webapp/src/main/java/com/wisemapping/webmvc/MindmapController.java
index 35c456f1..f15646fb 100644
--- a/wise-webapp/src/main/java/com/wisemapping/webmvc/MindmapController.java
+++ b/wise-webapp/src/main/java/com/wisemapping/webmvc/MindmapController.java
@@ -194,7 +194,7 @@ public class MindmapController {
 
         final String result = showMindmapEditorPage(id, model);
         model.addAttribute("readOnlyMode", true);
-        model.addAttribute("hid",hid);
+        model.addAttribute("hid",String.valueOf(hid));
         return result;
     }