QApplication crash on second run when mouse roll over window

#include <iostream>
#include <QtWidgets>

int qt_test(int& argc, char *argv[])
{
    QApplication app(argc,argv);
    QWidget window;
    window.resize(320, 240);
    window.show();
    window.setWindowTitle( QApplication::translate("toplevel", "UX QWidgets") );
    return app.exec(); // crash on the second run, only when the mouse roll on the window
}

int main(int argc, char *argv[])
{
    using std::cout, std::endl;
    cout << "QApplication bug" << endl;
    int res1 = qt_test(argc, argv); // OK
    cout << "Exit first QApplication - OK, res1: " << res1 << endl;
    int res2 = qt_test(argc, argv); // crash on mouse over
    cout << "Exit second QApplication using ALT+F4 res2: " << res2 << endl;
    return 0;
}

 1 QPointingDevicePrivate::pointById(int) const 
 2 QGuiApplicationPrivate::processMouseEvent(QWindowSystemInterfacePrivate::MouseEvent *) 
 3 QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent *) 
 4 QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) 
 5 QEventDispatcherWin32::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) 
 6 QWindowsGuiEventDispatcher::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) 
 7 QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) 
 8 QCoreApplication::exec() 
 9 qt_test main.cpp 11 
 10 main main.cpp 20