diff --git a/apps/presentationeditor/main/app/controller/Animation.js b/apps/presentationeditor/main/app/controller/Animation.js
index f653b31f4..bf70728f0 100644
--- a/apps/presentationeditor/main/app/controller/Animation.js
+++ b/apps/presentationeditor/main/app/controller/Animation.js
@@ -410,7 +410,7 @@ define([
                         } else { // add custom effect to appropriate group
                             if (group) {
                                 var items = store.where({group: group.get('id')});
-                                var index = (items && items.length>0) ? store.indexOf(items.at(items.length-1)) : store.length-1;
+                                var index = (items && items.length>0) ? store.indexOf(items[items.length-1]) : store.length-1;
                                 var rec = _.findWhere(Common.define.effectData.getEffectFullData(), {group: group.get('id'), value: this._state.Effect});
                                 item = store.add(new Common.UI.DataViewModel({
                                     group: group.get('id'),