Steps to reproduce the crash in Unity 2017.3 and 2017.2:
1. Download project from provided link (OwnCloud)
2. Open "Locomotions" scene (Assets->Scene)
3. Editor crashes

Steps to reproduce the crash in Unity 2017.1 and 5.6:
1. Download project from provided link (OwnCloud)
2. Open "Locomotions" scene (Assets->Scene)
3. Enter and exit play mode
4. Close project
5. Open Project
6. Editor crashes

Results: Editor crashes in Unity 2017.3 and 2017.2 when opening scene. In Unity 2017.1 and 5.6 Editor crashes when reopening project

Note: The only way how to open Locomotion scene is to open any other scene and enter and exit play mode. Locomotions scene still crashes when entering play mode

Reproduced with: 2017.2.0b3, 2017.2.0a2, 2017.1.0p2
Not reproducible with: 5.6.0a5
Regression introduced in: 5.6.0a6