Reproduction steps:
1. Open the project
2. Turn on SteamVR
3. Open "trailrenderer_clear_crash" scene
4. Play the scene with both Scene and Game window open.
5. Wait a couple seconds for the crash.

NOTE:When TrailRenderer.Clear() is called editor crashes.
NOTE: Not always reproducible, sometimes IsGetAtctive() error is thrown.
Reproduced on: 5.4.0f3, 5.4.0f2, 5.4.0f1
Project is not compatable with: 5.3.5f1, 5.5.0a4