Segfault on quitting viz3d using the 'q' key

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The same problem occurred on both of my Ubuntu and Windows machines, i.e., when I run the viz3d tutorial example and hit the 'q' key to quit, exceptions are thrown. But if I press 'e' instead, no error happens.

So for Windows, I have Windows-8_x64 + qt-5.3 + vtk-6.1.0 + opencv-2.4.10. When I run the example, the error is like:

Unhandled exception at 0x00007FFBBCD8A776 (opencv_viz2410d.dll) in testViz.exe: 0xC0000005: Access violation reading location 0x0000000000000000.

And the Visual Studio debugger takes me to the function in vizimpl.cpp:

void cv::viz::Viz3d::VizImpl::ExitCallback::Execute(vtkObject*, 
                                                    unsigned long event_id, 
                                                    void*)
{
    if (event_id == vtkCommand::ExitEvent)
    {
        viz->interactor_->TerminateApp();
        viz->interactor_ = 0;
    }
}

For Ubuntu, I have Ubuntu-12.04_x64 + qt-5.0.2 + vtk-6.1.0 + opencv-2.4.9, and the error is "Segmentation fault (core dumped)".

The stack of the QtCreator debugger GDB offered more insight:

0 cv::viz::Viz3d::VizImpl::ExitCallback::Execute(vtkObject, unsigned long, void) /usr/local/lib/libopencv_viz.so.2.4 0x7ffff7bb6048
1 vtkSubjectHelper::InvokeEvent vtkObject.cxx 620 0x7ffff5f20286
2 vtkObject::InvokeEvent vtkObject.cxx 789 0x7ffff5f20795
3 vtkRenderWindowInteractor::ExitCallback vtkRenderWindowInteractor.cxx 296 0x7ffff1fb5870
4 vtkInteractorStyle::OnChar vtkInteractorStyle.cxx 702 0x7ffff2006b4a
5 cv::viz::vtkVizInteractorStyle::OnChar() /usr/local/lib/libopencv_viz.so.2.4 0x7ffff7bc2193
6 vtkInteractorStyle::ProcessEvents vtkInteractorStyle.cxx 1145 0x7ffff20087dc
7 vtkCallbackCommand::Execute vtkCallbackCommand.cxx 42 0x7ffff5dbe02d
8 vtkSubjectHelper::InvokeEvent vtkObject.cxx 620 0x7ffff5f20286
9 vtkObject::InvokeEvent vtkObject.cxx 789 0x7ffff5f20795
10 vtkXRenderWindowInteractorCallback vtkXRenderWindowInteractor.cxx 857 0x7ffff15a4097
11 XtDispatchEventToWidget /usr/lib/x86_64-linux-gnu/libXt.so.6 0x7fffe805d256
12 ?? /usr/lib/x86_64-linux-gnu/libXt.so.6 0x7fffe805d9e6
13 XtDispatchEvent /usr/lib/x86_64-linux-gnu/libXt.so.6 0x7fffe805daa4
14 vtkXRenderWindowInteractor::Start vtkXRenderWindowInteractor.cxx 300 0x7ffff15a2259
15 cv::viz::Viz3d::VizImpl::spinOnce(int, bool) /usr/local/lib/libopencv_viz.so.2.4 0x7ffff7bb66af
16 main testViz.cpp 109 0x403eb3

So does someone have any idea, or get the same error? Could this be some bug in the viz module?