Fix viewer crash when zooming in on Mesh plot while watching simulation update
@@ -327,7 +327,7 @@ avtGeometryDrawable::ShiftByVector(const double vec[3])
for (int i = 0 ; i < nActors ; i++)
{
if (actors[i] != NULL && actors[i]->IsA("vtkActor") &&
- mapper->ActorIsShiftable(i))
+ mapper != NULL && mapper->ActorIsShiftable(i))
{
// VTK is ridiculous -- needs const.
double v[3];
