vktPropPicker->picker report read access violation

I am using both dicomseiral read and pickpixel example.
https://kitware.github.io/vtk-examples/site/Cxx/IO/ReadDICOMSeries/
https://kitware.github.io/vtk-examples/site/Cxx/Images/PickPixel/
Well, in my custom imageinteractorstyle I difen OnMouseMove function and code as in pickpixel exmaple.
I got a exception triggered in my Qt debugger as below:

I check the debugger, it seems no nullptr:

The GetEventPosition function can return the right position infomation.
I alse test the below code:

this->Picker->Pick(1.0,1.0,1.0,renderer);

it also return a exception.

Can someone help me?
If you need more debug information, just tell me.

Part of my OnMouseMove function:

void myVtkInteractorStyleImage::OnMouseMove(){
    vtkRenderWindowInteractor* interactor =
        this->_ImageViewer->GetRenderWindow()->GetInteractor();
    vtkRenderer* renderer = this->_ImageViewer->GetRenderer();
    vtkImageActor* actor = this->_ImageViewer->GetImageActor();
    vtkImageData* image = this->_ImageViewer->GetInput();
    vtkInteractorStyle* style =
            dynamic_cast<vtkInteractorStyle*>(interactor->GetInteractorStyle());
    this->Picker->Pick(1.0,1.0,1.0,renderer);
    // Pick at the mouse location provided by the interactor
    this->Picker->Pick(interactor->GetEventPosition()[0],
                       interactor->GetEventPosition()[1], 0.0, renderer);

    // There could be other props assigned to this picker, so
    // make sure we picked the image actor
    vtkAssemblyPath* path = this->Picker->GetPath();
    bool validPick = false;
    ......
    ......