Crash when save scene or load scene.

When saving the scene in Unity 2017.2.0b2, Unity hangs for 15 seconds, then crashes. The same happens when I created a new scene and opened it. I think the crash when the scene saves is happening because I have a custom editor script that converts scenes to a prefab when it saves, but I don't know why it crashes when loading a scene. If you need the log files tell me.