diff --git a/frontend-js/src/main/js/gui/Panel.js b/frontend-js/src/main/js/gui/Panel.js
index d4a1129b38d61d57078b1bab03267e0dcb85536f..d668c6a6992c850d2c316f7e32c566fc1f28b7ce 100644
--- a/frontend-js/src/main/js/gui/Panel.js
+++ b/frontend-js/src/main/js/gui/Panel.js
@@ -84,6 +84,10 @@ Panel.prototype.setMap = function (map) {
   this._map = map;
 };
 
+/**
+ *
+ * @returns {CustomMap}
+ */
 Panel.prototype.getMap = function () {
   return this._map;
 };
diff --git a/frontend-js/src/main/js/gui/leftPanel/OverlayPanel.js b/frontend-js/src/main/js/gui/leftPanel/OverlayPanel.js
index 206634e95edfe4320a4249f8b1ef72416da24445..47d2804b852b922fab276515773c6f834517ca60 100644
--- a/frontend-js/src/main/js/gui/leftPanel/OverlayPanel.js
+++ b/frontend-js/src/main/js/gui/leftPanel/OverlayPanel.js
@@ -350,7 +350,7 @@ OverlayPanel.prototype.refresh = function (showDefault) {
   }).then(function (customOverlays) {
 
     if (!showDefault) {
-      var id = self.getMap().getGoogleMap().getMapTypeId().replace(/\D/g, '');
+      var id = self.getMap().getBackgroundDataOverlay().getId();
       selectedOverlay[id] = true;
     }