Unity Editor Exception, probably a bug in build 17

I get following error occasionally out of the blue. I am assuming this is a bug in Unity 4.6 beta, and will be fixed in final release. Thanks


MissingReferenceException: The object of type 'ScrollRect' has been destroyed but you are still trying to access it.

Your script should either check if it is null or you should not destroy the object.
UnityEngine.Component.get_transform ()
UnityEngine.UI.ScrollRect.UnityEngine.UI.ICanvasElement.get_transform ()...

Unity Editor Exception, probably a bug in build 17