Crash related to refreshing imported model

1. New project.
2. Import 3D model.
3. Add imported 3D model to the scene.
4. Right-click the 3D model import file in the project palette, select Refresh Import.
5. Select another 3D model (the model in the scene will update).
6. Undo (Ctrl + z).
7. Crash.

The undo in this case would undo step 3 in the list above.