[Qt] QApplication::notify: Unexpected null receiver

[Павел Ишенин]

Hello, Items specific to the Qt widget set

Sorry, I have not searched deeply, but it is seems to me that this 
message is generated b bindings. After that message my qt applications 
usually crash. I just want to know:
- reason of message
- how to prevent
- if it is not possible to prevent then how to workaround crash

Best regards,
Paul Ishenin.