Python.exe has stopped working

[Alexis Dubois]

Hello !

I have this kind of message every time I quit my PyQt4 app whatever the method to quit is: a quit action menu, the windows "red cross", by quit(), close(), destroy(), deletelater(), ...

"python.exe has stopped working"
->Check online for a solution
->Close the program

I need to specify that the app is working nice, just have this message when quit.
Do you have an idea to help me understand this issue?

Thanks in advance
Best regards
Alexis