Crash when viewing Lightmap Density mode and with Vert

If the option in Project Settings for Accurate Velocities from Vertex Deformation is enabled and then using the View Mode for Lightmap Density you will get a hard crash.

1. Open UE4.
2. Go to Project Settings > Rendering and enable Accurate velocities from Vertex Deformation
3. Hit "Restart Editor" when prompted
4. Once the editor reboots and compiles shaders switch to the View Mode > lightmap density

Results: Editor will crash and not bring up crash reporter.

Expected: Editor will not crash.

Regression: No

"Accurate Velocities from Vertex Deformation" crashes in Lightmap Density viewmode