Reproduction steps:
1. Open the attached reproduction project (839779 - ReproProject.zip)
2. Open JavaEmulator.cs located in Assets\Cengatrix\Scripts\JavaEmulator
3. In JavaEmulator.cs (lines 27 and 28) set the location path of mlast.txt and message.txt
4. Open the "Splash" scene located in Assets\Common\Scenes\Splash.unity
5. Open the BallController.cs script located in Assets\Curling\Scripts\Controllers\
6. In BallController.cs place breakpoints on line 79 and 87
7. Attach the debugger to Unity.
8. Play the "Splash" scene
9. Press on the green ball and drag it to the edge
10. In the code editor (Visual Studio 2015 or MonoDevelop) press F10 (step over)
11. Unity crashes (check the attached reproduction video)

Note:
- Crashes with Visual Studio 2015 and MonoDevelop
- Doesn't reproduce on a new proejct