CefQuit crash at CefShutdown()

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app crash at CefShutdown() when quit

this issume can be fixed by :

change

MainWindow w; w.show(); //a.setQuitOnLastWindowClosed(false); result = a.exec(); -------------to------------------------------------ { MainWindow w; w.show(); //a.setQuitOnLastWindowClosed(false); result = a.exec(); } // left w release first