To reproduce:

1. Open the project, attached by tester
2. Build and run standalone
3. Select new game
4. Press '~' and then press g 7 times
5. Go left until crash (hold Space to jump)

Expected: game shouldn't crash at all when particular game object becomes visible in the scene
Actual: game crashes when the SkinnedMeshRenderer becomes visible in the scene

Reproduced in 5.6.0b11, 5.6.0f1, 5.6.0f2, 5.6.0f3
Could not reproduce in 2017.1, because some scripts in the project cannot be modified by API updater nor by hand.
Could not test for regression, because there is no easy way to recreate a project and Unity does not support backward compatibility

Fixed in 2017.2.0a4