http://bugs.winehq.org/show_bug.cgi?id=7555
------- Additional Comments From dmitry@codeweavers.com 2007-12-03 01:38 -------
It could be GetWindow returns 0, which is passed into MFC71.2372, which returns 0, which causes the crash. But GetWindow is asked for the next sibling, which is nil. Is it some obscure bug in wine's window management?
Only a test case which precisely reproduces what the app does while creating a similar window tree would tell.