Subscribing to 'loopPointReached' and 'prepareCompleted' events calls 'prepareCompleted' at the end of video playback

How to reproduce:
1. Open attached project "case_894319-Stripped"
2. Open scene "VR SplashScene"
3. Enter play mode
4. Notice no errors or exceptions in console after video stops playing

5. Uncomment line 35 of 'SplashManager.cs" to subscribe to "loopPointReached" events
6. Enter play mode again
7. Notice after video stops playing a Null Reference Exception is thrown in console

Reproduced on: 5.6.0b5, 5.6.0f2, 2017.1.0a5