How to reproduce:

1. Load two images
2. Open BasicImageProcessing View, select the "Resample to fit geometry of ..." operation from the two-image arithmetics operation list
3. Compute --> CRASH

The segmentation fault occurs from
l. 1203 ((QmitkSliderNavigatorWidget*)m_Controls->sliceNavigatorTime)->GetPos();

so this issue is similar to the one fixed for the TimeNavigationController in T19852.