diff --git a/lib/OpenLayers/Layer/WFS.js b/lib/OpenLayers/Layer/WFS.js
index 3089e31e12..3e3f70a1fa 100644
--- a/lib/OpenLayers/Layer/WFS.js
+++ b/lib/OpenLayers/Layer/WFS.js
@@ -115,11 +115,13 @@ OpenLayers.Layer.WFS.prototype =
         //add standard URL
         urls.push( this.getFullRequestString( { BBOX:bounds.toBBOX() }) );
 
-        // if there are more urls, add them.
-        for(var i=0; i < this.urls.length; i++) {
-            var newUrl = this.getFullRequestString( { BBOX:bounds.toBBOX() },
-                                                    this.urls[i] );
-            urls.push(newUrl);
+        if (this.urls != null) {
+            // if there are more urls, add them.
+            for(var i=0; i < this.urls.length; i++) {
+                var newUrl = this.getFullRequestString( { BBOX:bounds.toBBOX() },
+                                                        this.urls[i] );
+                urls.push(newUrl);
+            }
         }
 
         return new OpenLayers.Tile.WFS(this, position, bounds,