https://bugs.winehq.org/show_bug.cgi?id=52779
--- Comment #6 from Jacek Caban jacek@codeweavers.com --- That's a good finding, thanks. However, I don't see why init_window_call_params would fail in this case. If does that if we're called on a window that's either invalid or belongs to another thread. From what I can see in your logs, that should not be the case. Could you please check what exactly causes init_window_call_params to fail?