Haptic vs Force Feedback with Vive

When using Play Dynamic Force Feedback or Client Play Force Feedback with the “old” Vive controller, I’m getting this crash error in UE 4.10.1:

Access violation - code c0000005 (first/second chance not available)
UE4Editor_SteamController!FSteamController::UpdateVibration
etc.

I can feel and hear a very short vibration just before the crash. I also would like to see a curve example.