Steps to Reproduce:

1. Create an empty scene with Main Camera and Directional Light if not there by default
2.Create a 3D cube
3.Add another cube as a child of existing cube
4. Uncheck, check static property on the parent cube
5. Check console for errors
6. Download Adam character Pack from the asset store in same project

https://www.assetstore.unity3d.com/en/#!/content/74842

7. Try opening the LuScene and observe the crash

Actual Results:
Unity Editor crashes

Expected Results:
Editor works fine

Frequency:
Always

Platform:
MacOS X 10.12

Reproducible with:
2017.3.0b8 , 2017.3.0b7

Working with:
20172.20f3 , 2017.1.1 , 2017.1

Note:

the error and crash are related to the scene and lighting since checking and unchecking the static box makes a difference to lighting setting of a scene (we see an error pop up) and the moment we open a new scene, the editor crashes.