Small error.

js/ggl_map_markers.js

@@ -254,7 +254,7 @@
         _self.lastOpenMarker = marker;
 
         // To fix the positioning of the infoWindow after loading the definite content.
-        infoWindow.open(Drupal.vlMap.map, marker);
+        infoWindow.open(Drupal.gglMap.map, marker);
 
         // Trigger external JS after opening popup.
         $(window).trigger('gglMap:afterOpenPopup',  marker);