[vtkusers] Segfault when Adding Renderer in Linux but now Window

[robert.hedges at lickenbrocktech.com]

 I'm running VTK master branch (qt 5.10.1) and have code that will run in Windows but not in Linux:
 
The ui file defines the qvtkWidget as a QVTKOpenGLWidget
 
These lines run as expected:
 
 
vtkSmartPointer<vtkGenericOpenGLRenderWindow> vRendWin=vtkSmartPointer<vtkGenericOpenGLRenderWindow>::New();
vtkSmartPointer<vtkRenderer> vRend=vtkSmartPointer<vtkRenderer>::New();
 ui.qvtkWidget->SetRenderWindow(vRendWin);
 
However, this line causes a segfault:
 
ui.qvtkWidget->GetRenderWindow()->AddRenderer(vRend);
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