[PyQt] "Pythonw.exe stopped working error" for PyQt4\examples\dialogs\standarddialogs.pyw on Windows

[iMath]

1) run the example by pythonw command,



2) uncheck this



3) click the first button , cancel the popped dialog‍





4) close this window ‍


then the  "Pythonw.exe stopped working error" dialog will  pop up on Windows .‍


why this error happened here ?
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