I'm using EPiServer's LightWeight Dojo widget to display a dialog.

It's working fine, except for the close button (the little "x" in the title bar) which doesn't work (i.e. it doesn't close the dialog).

Whenever it's clicked, I get a script error:

Cannot read property 'userSetTransformId' of null

Not sure if this is a bug, or something else? I'm now working around it by overriding the _endDrag where the script error occurs. :/