Steps to reproduce :

- download the project attached
- create a new project
- in the root folder of the project copy the scripts GetClass.cs, LoadScene.cs, Type0.cs and Type1.cs
- create a new Editor folder and copy the GetClassInspector.cs into it
- make sure all the scripts are copied before regaining focus to Unity so it does not compile only part of the scripts
- switch to Unity and drag the GetClass.cs to the Main Camera
- drag the script GetClass.cs in the first Source Target field and Unity will crash

*Note:
The crash does not occur again if Unity is restarted after it crashed.