diff --git a/lib/OpenLayers/Layer/Grid.js b/lib/OpenLayers/Layer/Grid.js
index f5be57fb87..1f0e5a76ce 100644
--- a/lib/OpenLayers/Layer/Grid.js
+++ b/lib/OpenLayers/Layer/Grid.js
@@ -63,12 +63,19 @@ OpenLayers.Layer.Grid.prototype =
                                             this.params,
                                             this.options);
         }
-        
-        // copy/set any non-init, non-simple values here
-        obj.tileSize = this.tileSize.copyOf();
-        
+
         //get all additions from superclasses
-        return OpenLayers.Layer.HTTPRequest.prototype.clone.apply(this, [obj]);
+        obj = OpenLayers.Layer.HTTPRequest.prototype.clone.apply(this, [obj]);
+
+        // copy/set any non-init, non-simple values here
+        if (this.tileSize != null) {
+            obj.tileSize = this.tileSize.copyOf();
+        }
+        
+        // we do not want to copy reference to grid. that should stay at null
+        obj.grid = null;
+
+        return obj;
     },    
 
     /** When the layer is added to a map, then we can ask the map for