Repro steps:
1) Open scene Procedural Testing
2) Play the game

Faults of crash:
Log says: 'Non-convex MeshCollider with non-kinematic Rigidbody is no longer supported in Unity 5.
If you want to use a non-convex mesh either make the Rigidbody kinematic or remove the Rigidbody component. Scene hierarchy path "TestSphere", Mesh asset path "" Mesh name "Cube"'. By making the object's Rigidbody kinematic, game crashes no more.