When minimizing a maximized Editor window, Unity unexpectedly resets all windows.

[jakesee]

Not sure if this is the right place to post, but it only happens to XNode editor. I am using XNode 1.8 and XNode Groups 1.0.

After working in maximised docked window, when I try to minimize the editor window, unity gives the following warning dialog. (There is no error in a single standalone maximised window)

If I click quit, Unity quits the application. If I click continue, it resets all window layout to default and shows the follow error:

Maximized serialized file backup not found.
UnityEditor.GenericMenu:CatchMenu (object,string[],int)

Has anyone encountered this? Any idea how to fix? Or debug?