[Trunk] Closing a newly-created score during playback of another and stopping causes crash

I can also produce in a different order (not sure if it constitutes a different report), but it only happens sometimes - suggesting I have to do something perhaps very specific (similar to this: #12561: [Trunk] Closing a playing score with impending save, cancel and stopping score causes crash):

1. Open score.
2. Create score.
3. Play.
4. Close the score opened in step 1.
5. Stop.

Result: Crash.

Discussion: Here's the crash log .

Using MuseScore 2.0 Nightly Build (5179) - Mac 10.6.8.

I now have a crash log for the steps in the original post.

I could only reproduce sometimes - there must be something more specific required.

Using MuseScore 2.0 Nightly Build (5180) - Mac 10.6.8.

This may have been fixed (https://github.com/musescore/MuseScore/commit/25bfd0d)?

I believe it's fixed.

Using MuseScore 2.0 Nightly Build (a8a7c0b) - Mac 10.7.4.