Repro steps:

1. Open "MinimalReproProject.zip"
2. Click on the Main Camera in the Hierarchy window
3. In the Inspector window click on "Add Component"
4. Add "RechalkCamEffect"

Expected Result: The selected script is added to the Main Camera
Actual Result: The Unity Editor crashes

Reproduced with: 2017.2.0b3, 2017.2.0a4, 2017.2.0a2
Regression introduced in: 2017.2.0a2
Did not reproduce on: 2017.2.0a1, 2017.1.0f3, 5.6.2p3

Note:
Deleting everything expect the Assets folder fixes the issue