diff --git a/lib/OpenLayers/Map.js b/lib/OpenLayers/Map.js
index 2116c2f9bf..11f69950bc 100644
--- a/lib/OpenLayers/Map.js
+++ b/lib/OpenLayers/Map.js
@@ -786,8 +786,10 @@ OpenLayers.Map.prototype = {
         var originPx = this.getViewPortPxFromLonLat(this.layerContainerOrigin);
         var newPx = this.getViewPortPxFromLonLat(lonlat);
 
-        this.layerContainerDiv.style.left = (originPx.x - newPx.x) + "px";
-        this.layerContainerDiv.style.top  = (originPx.y - newPx.y) + "px";
+        if ((originPx != null) && (newPx != null)) {
+            this.layerContainerDiv.style.left = (originPx.x - newPx.x) + "px";
+            this.layerContainerDiv.style.top  = (originPx.y - newPx.y) + "px";
+        }
     },
 
     /**