- Import the attached project
- Make sure editor_tool_sceen.unity is the opened scene
- On the Main Camera make sure the SSSAO component is enabled
- On that component change Visualization to View Bleeding
- Reset all component values to their default (using the Reset option from the context menu of the component)
- Disable the component

Unity crashes!

This case looks very similar to http://issuetracker.unity3d.com/issues/passing-null-to-materialeditor-dot-getmaterialproperties-crashes-at-pptr-operator-shader-star-ptr64 which is already fixed. This one crashes in older Unity versions as well