1. Create a new project
2. Import The Courtyard 1.0 from the asset store
3. When prompted, Go Ahead with API update
4. Open Scenes/Courtyard.unity
5. Quit Unity

Expected results:
Unity closes the scene and quits

Actual results:
Unity crashes every time, displaying the bug reporter

Regression:
This does not happen in 5.3

Notes:
Closing the scene in other ways, such as by creating a fresh new scene, has also triggered the crash. However, it doesn't seem to do so every time like quitting does.