cgal the demo Polyhedron, the debugger Crashes in qscopedpointer.h

I haven't make any change in this demo, and it works fine firstly. But after lunch, I ran it again, the debugger crashed, and I got an error(below), the debugger reached this line in qscopedpointer.h:

inline T *data() const

{ return d; }

error:

Unhandled exception at 0x00007FFDE604516A (Qt5Guid.dll) in Polyhedron_3.exe: 0xC000041D: Access violation reading location 0x00000004: an unhandled exception was encountered during a user callback.

stack trace like this:

Qt5Guid.dll!QScopedPointer >::data() Line 135 C++ Qt5Guid.dll!qGetPtrHelper >>(const QScopedPointer > & p) Line 983 C++

Qt5Guid.dll!QScreen::d_func() Line 59 C++

Qt5Guid.dll!QScreen::geometry() Line 302 C++

qwindowsd.dll!QWindowsWindow::isFullScreen_sys() Line 1630 C++

qwindowsd.dll!QWindowsWindow::handleResized(int wParam) Line 1394 C++

qwindowsd.dll!QWindowsContext::windowsProc(HWND__ * hwnd, unsigned int message,
QtWindows::WindowsEventType et, unsigned __int64 wParam, __int64 lParam, __int64 * result) Line 1011 C++

qwindowsd.dll!qWindowsWndProc(HWND__ * hwnd, unsigned int message, unsigned __int64 wParam, __int64 lParam) Line 1271 C++

qwindowsd.dll!qWindowsWndProc(HWND__ * hwnd, unsigned int message, unsigned __int64 wParam, __int64 lParam) Line 1280 C++

qwindowsd.dll!WindowCreationData::initialize(const QWindow * w, HWND__ * hwnd, bool frameChange, double opacityLevel) Line 707 C++

qwindowsd.dll!QWindowsWindow::setWindowFlags_sys(QFlags wt, unsigned int flags) Line 1571 C++

qwindowsd.dll!QWindowsWindow::setParent_sys(const QPlatformWindow * parent) Line 1294 C++

qwindowsd.dll!QWindowsWindow::setParent(const QPlatformWindow * newParent) Line 1260 C++

Qt5Guid.dll!QWindow::setParent(QWindow * parent) Line 614 C++

Qt5Widgetsd.dll!q_createNativeChildrenAndSetParent(const QWidget * parentWidget) Line 1377 C++

Qt5Widgetsd.dll!q_createNativeChildrenAndSetParent(const QWidget * parentWidget) Line 1382 C++

Qt5Widgetsd.dll!QWidgetPrivate::create_sys(unsigned __int64 window, bool initializeWindow, bool destroyOldWindow) Line 1481 C++

Qt5Widgetsd.dll!QWidget::create(unsigned __int64 window, bool initializeWindow, bool destroyOldWindow) Line 1321 C++

Qt5Widgetsd.dll!QWidget::setVisible(bool visible) Line 8060 C++

Qt5Widgetsd.dll!QWidget::show() Line 7671 C++

Polyhedron_3.exe!main(int argc, char * * argv) Line 51 C++

Polyhedron_3.exe!__tmainCRTStartup() Line 626 C

Polyhedron_3.exe!mainCRTStartup() Line 466 C

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I have no idea what the issue is. I appreciate if anyone could give me some advise to solve this. Thanks.