Undo in this score causes crash

1. Open score (from here ).

2. Double-click note in first bar.
3. Move right a few times (via keyboard).
4. 'Undo'.

2. Select note.
3. 'Delete'.
4. 'Undo'.

2. Select note.
3. 'Flip direction'.
4. 'Undo'.

Result: Crash.

Discussion: It seems this score doesn't like Undo. I post these examples as they could all be connected.

Using MuseScore 2.0 Nightly Build (8c5101a) - Mac 10.7.4.