ExtJS v4.1.1a

I'm getting an error when using a loader for a ToolTip (pulling back data for a template).

It occurs during the ElementLoader.onComplete method, indicating that "scope" is undefined, but actually it's the "active" property which is undefined.

The onComplete method assumes that "me.active" is defined and has a "scope" property.

The error appears to occur when a number of requests are active (can easily occur if the user moves their mouse around over numerous elements that trigger this call).

Any suggestions?

Thanks.