Crash on delete measure

On deleting the last measures from an imported MIDI score, the application crashes. Here is the crash report:

Process: mscore [659]
Path: /Applications/Music/MuseScore.app/Contents/MacOS/mscore
Identifier: net.sourceforge.mscore
Version: 0.9 (0.9.5)
Code Type: X86 (Native)
Parent Process: launchd [88]

Date/Time: 2009-12-01 01:06:08.040 -0800
OS Version: Mac OS X 10.6.2 (10C540)
Report Version: 6

Exception Type: EXC_BAD_ACCESS (SIGBUS)
Exception Codes: KERN_PROTECTION_FAILURE at 0x0000000000000004
Crashed Thread: 0 Dispatch queue: com.apple.main-thread

Thread 0 Crashed: Dispatch queue: com.apple.main-thread
0 net.sourceforge.mscore 0x00055389 Score::cmdDeleteSelectedMeasures() + 41
1 net.sourceforge.mscore 0x000558b9 Score::cmdDeleteSelection() + 905
2 net.sourceforge.mscore 0x0004bf39 Score::cmd(QString const&) + 3321
3 net.sourceforge.mscore 0x0013b425 MuseScore::cmd(QAction*) + 7397
4 net.sourceforge.mscore 0x0000d369 MuseScore::qt_metacall(QMetaObject::Call, int, void**) + 361
5 QtCore 0x02b7dfec QMetaObject::activate(QObject*, int, int, void**) + 556
6 QtGui 0x01f3ab5e QActionGroup::triggered(QAction*) + 62
7 QtGui 0x01f3ae13 QActionGroup::setEnabled(bool) + 243
8 QtGui 0x01f3b311 QActionGroup::qt_metacall(QMetaObject::Call, int, void**) + 625
9 QtCore 0x02b7dfec QMetaObject::activate(QObject*, int, int, void**) + 556
10 QtGui 0x01f3689c QAction::triggered(bool) + 76
11 QtGui 0x01f389ff QAction::activate(QAction::ActionEvent) + 159
12 QtGui 0x01f38b33 QAction::event(QEvent*) + 211
13 QtGui 0x01f3dc0f QApplicationPrivate::notify_helper(QObject*, QEvent*) + 191
14 QtGui 0x01f4473c QApplication::notify(QObject*, QEvent*) + 268
15 QtCore 0x02b6bbd2 QCoreApplication::notifyInternal(QObject*, QEvent*) + 98
16 QtGui 0x01f6caa1 QShortcut::QShortcut(QWidget*) + 929
17 QtGui 0x01f6e605 QShortcut::QShortcut(QWidget*) + 7941
18 QtGui 0x01f45c8b QApplication::notify(QObject*, QEvent*) + 5723
19 QtCore 0x02b6bbd2 QCoreApplication::notifyInternal(QObject*, QEvent*) + 98
20 QtGui 0x01f3bc4c QApplicationPrivate::currentPlatform() + 76
21 QtGui 0x01f9c159 qt_mac_secure_keyboard(bool) + 505
22 QtGui 0x01f9d551 qt_mac_secure_keyboard(bool) + 5617
23 QtGui 0x01ed4bf4 QApplicationPrivate::globalEventProcessor(OpaqueEventHandlerCallRef*, OpaqueEventRef*, void*) + 2708
24 com.apple.HIToolbox 0x94fcfe29 DispatchEventToHandlers(EventTargetRec*, OpaqueEventRef*, HandlerCallRec*) + 1567
25 com.apple.HIToolbox 0x94fcf0f0 SendEventToEventTargetInternal(OpaqueEventRef*, OpaqueEventTargetRef*, HandlerCallRec*) + 411
26 com.apple.HIToolbox 0x94fcef4f SendEventToEventTargetWithOptions + 58
27 com.apple.HIToolbox 0x95003713 ToolboxEventDispatcherHandler(OpaqueEventHandlerCallRef*, OpaqueEventRef*, void*) + 1957
28 com.apple.HIToolbox 0x94fd027a DispatchEventToHandlers(EventTargetRec*, OpaqueEventRef*, HandlerCallRec*) + 2672
29 com.apple.HIToolbox 0x94fcf0f0 SendEventToEventTargetInternal(OpaqueEventRef*, OpaqueEventTargetRef*, HandlerCallRec*) + 411
30 com.apple.HIToolbox 0x94ff1981 SendEventToEventTarget + 52
31 QtGui 0x01ee96d4 non-virtual thunk to QDesktopWidget::~QDesktopWidget() + 2276
32 QtCore 0x02b6b171 QEventLoop::processEvents(QFlags) + 65
33 QtCore 0x02b6b33d QEventLoop::exec(QFlags) + 189
34 QtCore 0x02b6f0ae QCoreApplication::exec() + 174
35 net.sourceforge.mscore 0x00143278 main + 9880
36 net.sourceforge.mscore 0x00009652 _start + 216
37 net.sourceforge.mscore 0x00009579 start + 41

Thread 1: Dispatch queue: com.apple.libdispatch-manager
0 libSystem.B.dylib 0x96cee0ea kevent + 10
1 libSystem.B.dylib 0x96cee804 _dispatch_mgr_invoke + 215
2 libSystem.B.dylib 0x96cedcc3 _dispatch_queue_invoke + 163
3 libSystem.B.dylib 0x96ceda68 _dispatch_worker_thread2 + 234
4 libSystem.B.dylib 0x96ced4f1 _pthread_wqthread + 390
5 libSystem.B.dylib 0x96ced336 start_wqthread + 30

Thread 2:
0 libSystem.B.dylib 0x96ce6856 select$DARWIN_EXTSN + 10
1 com.apple.CoreFoundation 0x95961ddd __CFSocketManager + 1085
2 libSystem.B.dylib 0x96cf4fbd _pthread_start + 345
3 libSystem.B.dylib 0x96cf4e42 thread_start + 34

Thread 3:
0 libSystem.B.dylib 0x96cc78da mach_msg_trap + 10
1 libSystem.B.dylib 0x96cc8047 mach_msg + 68
2 ....audio_hijack_server.hermes 0x03d9a9b2 ah_serv_loop + 132
3 libSystem.B.dylib 0x96cf4fbd _pthread_start + 345
4 libSystem.B.dylib 0x96cf4e42 thread_start + 34

Thread 4:
0 libSystem.B.dylib 0x96cc78da mach_msg_trap + 10
1 libSystem.B.dylib 0x96cc8047 mach_msg + 68
2 com.apple.audio.midi.CoreMIDI 0x02ddcf31 XServerMachPort::ReceiveMessage(int&, void*, int&) + 155
3 com.apple.audio.midi.CoreMIDI 0x02dfb8fe MIDIProcess::RunMIDIInThread() + 150
4 com.apple.audio.midi.CoreMIDI 0x02dde149 XThread::RunHelper(void*) + 17
5 com.apple.audio.midi.CoreMIDI 0x02dddb16 CAPThread::Entry(CAPThread*) + 96
6 libSystem.B.dylib 0x96cf4fbd _pthread_start + 345
7 libSystem.B.dylib 0x96cf4e42 thread_start + 34

Thread 5:
0 libSystem.B.dylib 0x96cc793a semaphore_timedwait_signal_trap + 10
1 libSystem.B.dylib 0x96cf5445 _pthread_cond_wait + 1066
2 libSystem.B.dylib 0x96d24028 pthread_cond_timedwait_relative_np + 47
3 com.apple.audio.CoreAudio 0x94020965 CAGuard::WaitFor(unsigned long long) + 219
4 com.apple.audio.CoreAudio 0x94023997 CAGuard::WaitUntil(unsigned long long) + 289
5 com.apple.audio.CoreAudio 0x94021294 HP_IOThread::WorkLoop() + 1892
6 com.apple.audio.CoreAudio 0x94020b2b HP_IOThread::ThreadEntry(HP_IOThread*) + 17
7 com.apple.audio.CoreAudio 0x94020a42 CAPThread::Entry(CAPThread*) + 140
8 libSystem.B.dylib 0x96cf4fbd _pthread_start + 345
9 libSystem.B.dylib 0x96cf4e42 thread_start + 34

Thread 0 crashed with X86 Thread State (32-bit):
eax: 0x209baa00 ebx: 0x00000000 ecx: 0x1fccf8d0 edx: 0x00000000
edi: 0x1fce6950 esi: 0x209ba730 ebp: 0xbfffdcf8 esp: 0xbfffdcc0
ss: 0x0000001f efl: 0x00010206 eip: 0x00055389 cs: 0x00000017
ds: 0x0000001f es: 0x0000001f fs: 0x00000000 gs: 0x00000037
cr2: 0x00000004

Binary Images:
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0x2d50000 - 0x2d5efff +libportaudio.2.dylib ??? (???) /Applications/Music/MuseScore.app/Contents/Frameworks/libportaudio.2.dylib
0x2d63000 - 0x2dbfff3 +libsndfile.1.dylib ??? (???) <2E0FDBAE-F552-F9C4-B022-CC7CC74DFD8D> /Applications/Music/MuseScore.app/Contents/Frameworks/libsndfile.1.dylib
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0x3b76000 - 0x3bbafef +libFLAC.8.dylib ??? (???) /Applications/Music/MuseScore.app/Contents/Frameworks/libFLAC.8.dylib