Frequent crashes on closing editor window

QtCreator crashes very often with SIGSEGV when closing an editor window (strg+w).

Hope this helps:

Process: Qt Creator [393]
Path: /Applications/Qt Creator.app/Contents/MacOS/Qt Creator
Identifier: org.qt-project.qtcreator
Version: 3.0.0 (3.0.0)
Code Type: X86-64 (Native)
Parent Process: launchd [199]

Date/Time: 2014-01-04 15:05:06.667 +0100
OS Version: Mac OS X 10.6.8 (10K549)
Report Version: 6

Interval Since Last Report: 17571110 sec
Crashes Since Last Report: 1354
Per-App Interval Since Last Report: 250450 sec
Per-App Crashes Since Last Report: 30
Anonymous UUID: A4B7B231-FB42-4C87-9EE6-AD69A8FB7FEA

Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0x000000015a0b7b50
Crashed Thread: 0 Dispatch queue: com.apple.main-thread

Thread 0 Crashed: Dispatch queue: com.apple.main-thread
0 QtCore 0x0000000100e01ba9 QCoreApplication::notifyInternal(QObject*, QEvent*) + 89
1 QtCore 0x0000000100e5300d QTimerInfoList::activateTimers() + 973
2 libqcocoa.dylib 0x0000000103773535 qt_plugin_instance + 74965
3 com.apple.CoreFoundation 0x00007fff80f373d1 __CFRunLoopDoSources0 + 1361
4 com.apple.CoreFoundation 0x00007fff80f355c9 __CFRunLoopRun + 873
5 com.apple.CoreFoundation 0x00007fff80f34d8f CFRunLoopRunSpecific + 575
6 com.apple.HIToolbox 0x00007fff80aee7ee RunCurrentEventLoopInMode + 333
7 com.apple.HIToolbox 0x00007fff80aee5f3 ReceiveNextEventCommon + 310
8 com.apple.HIToolbox 0x00007fff80aee4ac BlockUntilNextEventMatchingListInMode + 59
9 com.apple.AppKit 0x00007fff81d62eb2 _DPSNextEvent + 708
10 com.apple.AppKit 0x00007fff81d62801 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 155
11 com.apple.AppKit 0x00007fff81d2868f -[NSApplication run] + 395
12 libqcocoa.dylib 0x00000001037742a7 qt_plugin_instance + 78407
13 QtCore 0x0000000100dff05d QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) + 397
14 QtCore 0x0000000100e02162 QCoreApplication::exec() + 354
15 org.qt-project.qtcreator 0x000000010000d3cc main + 22732
16 org.qt-project.qtcreator 0x0000000100004cf4 start + 52