Steps to reproduce:

1) Open the attached project 'testProject.zip' or create a new one.
2) Open the 'Animation' tab.
3) Select any item from the Hierarchy (Main Camera, for example).
4) Click 'Create' in the Animation tab and create an animation.
5) Click 'Add Property'button and start adding properties.
- It doesn't matter which properties are added.
> Unity crashes after adding 3-4 properties.

*Note: sometimes Unity doesn't crash until the project is reopened, or a different project is opened.