To reproduce:
1. Open the attached project;
2. Build and run "DemoRegion" scene;
3. Using HTC Vive controllers, shoot at the enemy.

Expected result: Player doesn't crash when hitting an enemy.
Actual result: Player crashes.

Note:
-When hitting the enemy in "DemoRegion" scene, Editor doesn't crash.

Reproduced on versions: 5.5.0f3, 5.5.0p1.
Not reproduced on versions: 5.5.0p2, 5.5.0p3, 5.5.2f1.
(Couldn't reproduce on 5.6 versions because Vive controllers are not activated in the Unity Player: https://issuetracker.unity3d.com/issues/vr-slash-regression-vive-controllers-are-not-activated-and-do-not-function-in-scenes-with-steamvr-camera-rig )