diff --git a/external/L.Control.Zoomslider.css b/external/L.Control.Zoomslider.css
index 59317566..5e70bbee 100644
--- a/external/L.Control.Zoomslider.css
+++ b/external/L.Control.Zoomslider.css
@@ -17,7 +17,7 @@
 	height:5px;
 	background-color: black;
 	background-position: center;
- 	-webkit-border-radius: 15px;
+  -webkit-border-radius: 15px;
 	border-radius: 15px;
 	margin-left: 5px;
 	/*border: 5px; */
@@ -36,7 +36,7 @@
 
 .leaflet-dragging .leaflet-control-zoomslider,
 .leaflet-dragging .leaflet-control-zoomslider-slider,
-.leaflet-dragging .leaflet-control-zoomslider-slider-body, 
+.leaflet-dragging .leaflet-control-zoomslider-slider-body,
 .leaflet-dragging .leaflet-control-zoomslider a,
 .leaflet-dragging .leaflet-control-zoomslider a.leaflet-control-zoomslider-disabled,
 .leaflet-dragging .leaflet-control-zoomslider-slider-knob:hover  {
diff --git a/plugins/zoom-slider.user.js b/plugins/zoom-slider.user.js
index dc864bd2..a0b41b7b 100644
--- a/plugins/zoom-slider.user.js
+++ b/plugins/zoom-slider.user.js
@@ -27,10 +27,12 @@ window.plugin.zoomSlider.setup  = function() {
   try { console.log('Loading Leaflet.zoomslider JS now'); } catch(e) {}
   @@INCLUDERAW:external/L.Control.Zoomslider.js@@
   try { console.log('done loading Leaflet.zoomslider JS'); } catch(e) {}
-  
-  window.map.removeControl(map.zoomControl);
+
+  if(map.zoomControl._map) {
+    window.map.removeControl(map.zoomControl);
+  }
   window.map.addControl(L.control.zoomslider());
-  
+
   $('head').append('<style>@@INCLUDESTRING:external/L.Control.Zoomslider.css@@</style>');
 };