diff --git a/javascript/LeftAndMain.js b/javascript/LeftAndMain.js
index 2867b9e8..bf3eb521 100644
--- a/javascript/LeftAndMain.js
+++ b/javascript/LeftAndMain.js
@@ -903,7 +903,7 @@ Behaviour.register({
             }
             this.resetChanged = function() {
                 inst = tinyMCE.getInstanceById(this.id);
-                inst.startContent = tinymce.trim(inst.getContent({format : 'raw', no_events : 1}));
+                if (inst) inst.startContent = tinymce.trim(inst.getContent({format : 'raw', no_events : 1}));
             }
         }
     }