undefined check

static/nb.js

@@ -74,6 +74,9 @@ function nbInit(a,b){
     }
 
     function recursiveObjectSet(item, value){
+        if (typeof item === 'undefined'){
+            return;
+        }
         for (var key in value){
             if (typeof value[key] !== 'object'){
                 item[key] = value[key];