diff --git a/frontend-js/src/main/js/map/CustomMap.js b/frontend-js/src/main/js/map/CustomMap.js
index c66f943329a26318b731890cc798381e239df480..1b085309c15244fef84f2b3f25fc756540896fa7 100644
--- a/frontend-js/src/main/js/map/CustomMap.js
+++ b/frontend-js/src/main/js/map/CustomMap.js
@@ -10,7 +10,6 @@ var Alias = require('./data/Alias');
 var CommentDialog = require('../gui/CommentDialog');
 var ConfigurationType = require('../ConfigurationType');
 var CustomMapOptions = require('./CustomMapOptions');
-var GuiConnector = require('../GuiConnector');
 var IdentifiedElement = require('./data/IdentifiedElement');
 var DataOverlay = require('./data/DataOverlay');
 var Reaction = require('./data/Reaction');
@@ -32,9 +31,6 @@ var Point = require('./canvas/Point');
  * @extends AbstractCustomMap
  */
 function CustomMap(options) {
-  //@type {HTMLElement[]}
-  this._controls = [];
-
   if (!(options instanceof CustomMapOptions)) {
     options = new CustomMapOptions(options);
   }
@@ -467,7 +463,7 @@ CustomMap.prototype.openSubmap = function (id) {
           return self.refreshMarkers();
         });
       }
-    }).then(function (value) {
+    }).then(function () {
       return self.callListeners("onSubmapOpen", {mapId: id});
     });
   } else {