diff --git a/src/webui/static/app/idnode.js b/src/webui/static/app/idnode.js
index db45147..6f2fad8 100644
--- a/src/webui/static/app/idnode.js
+++ b/src/webui/static/app/idnode.js
@@ -155,7 +155,7 @@ tvheadend.IdNodeField = function (conf)

     var st = this.store;
     return function (v) {
-      if (st && st.find) {
+      if (st instanceof Ext.data.JsonStore) {
         var t = []
         var d;
         if (v.push)