Application that crashed: kontact
Version of the application: 4.3.2
KDE Version: 4.3.2 (KDE 4.3.2)
Qt Version: 4.5.2
Operating System: Linux 2.6.31-14-generic i686
Distribution: Ubuntu 9.10

What I was doing when the application crashed:
I'm not sure, kontact crashes if kontact was closed recently and is being restartet. Doesn't happen when startet first time. Seems like kontact hasn't closed correctly before

 -- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
[KCrash Handler]
#6  QString (this=0x7572742f) at /usr/include/qt4/QtCore/qstring.h:711
#7  Kontact::Plugin::identifier (this=0x7572742f) at ../../kontactinterfaces/plugin.cpp:97
#8  0x0059050e in Kontact::MainWindow::activatePluginModule (this=0x9e91108) at ../../../kontact/src/mainwindow.cpp:303
#9  0x005905c4 in Kontact::MainWindow::setActivePluginModule (this=0x9e91108, module=...) at ../../../kontact/src/mainwindow.cpp:281
#10 0x0804bd0f in KontactApp::newInstance (this=0xbf8c5b24) at ../../../kontact/src/main.cpp:147
#11 0x00802380 in KUniqueApplicationAdaptor::newInstance (this=0x9ef4a60, asn_id=..., args=...) at ../../kdeui/kernel/kuniqueapplication.cpp:459
#12 0x00802a92 in KUniqueApplicationAdaptor::qt_metacall (this=0x9ef4a60, _c=QMetaObject::InvokeMetaMethod, _id=0, _a=0xbf8c514c) at ./kuniqueapplication_p.moc:75
#13 0x005ca7b4 in QDBusConnectionPrivate::deliverCall (this=0x9e75c90, object=0x9ef4a60, msg=..., metaTypes=..., slotIdx=4) at qdbusintegrator.cpp:891
#14 0x005cb9c5 in QDBusConnectionPrivate::activateCall (this=0x9e75c90, object=0x9ef4a60, flags=337, msg=...) at qdbusintegrator.cpp:803
#15 0x005cc234 in QDBusConnectionPrivate::activateObject (this=0x9e75c90, node=..., msg=..., pathStartPos=16) at qdbusintegrator.cpp:1347
#16 0x005cc4da in QDBusActivateObjectEvent::placeMetaCall (this=0xae4f948) at qdbusintegrator.cpp:1464
#17 0x00ca35fe in QObject::event (this=0xbf8c5b24, e=0xae4f948) at kernel/qobject.cpp:1111
#18 0x00c92ffb in QCoreApplication::event (this=0xbf8c5b24, e=0xae4f948) at kernel/qcoreapplication.cpp:1434
#19 0x010839a6 in QApplication::event (this=0xbf8c5b24, e=0xae4f948) at kernel/qapplication.cpp:2317
#20 0x0107df54 in QApplicationPrivate::notify_helper (this=0x9e90f18, receiver=0xbf8c5b24, e=0xae4f948) at kernel/qapplication.cpp:4056
#21 0x0108567c in QApplication::notify (this=0xbf8c5b24, receiver=0xbf8c5b24, e=0xae4f948) at kernel/qapplication.cpp:3603
#22 0x007fabfa in KApplication::notify (this=0xbf8c5b24, receiver=0xbf8c5b24, event=0xae4f948) at ../../kdeui/kernel/kapplication.cpp:302
#23 0x00c936cb in QCoreApplication::notifyInternal (this=0xbf8c5b24, receiver=0xbf8c5b24, event=0xae4f948) at kernel/qcoreapplication.cpp:610
#24 0x00c942b2 in QCoreApplication::sendEvent (receiver=0x0, event_type=0, data=0x9e5d820) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#25 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x9e5d820) at kernel/qcoreapplication.cpp:1247
#26 0x00c9447d in QCoreApplication::sendPostedEvents (receiver=0x0, event_type=0) at kernel/qcoreapplication.cpp:1140
#27 0x00cbe3ff in QCoreApplication::sendPostedEvents (s=0x9e7e798) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:218
#28 postEventSourceDispatch (s=0x9e7e798) at kernel/qeventdispatcher_glib.cpp:210
#29 0x022e2e78 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#30 0x022e6720 in ?? () from /lib/libglib-2.0.so.0
#31 0x022e6853 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#32 0x00cbe02c in QEventDispatcherGlib::processEvents (this=0x9e5d9f8, flags=...) at kernel/qeventdispatcher_glib.cpp:327
#33 0x0111ebe5 in QGuiEventDispatcherGlib::processEvents (this=0x9e5d9f8, flags=...) at kernel/qguieventdispatcher_glib.cpp:202
#34 0x00c91c79 in QEventLoop::processEvents (this=0xbf8c5a84, flags=) at kernel/qeventloop.cpp:149
#35 0x00c920ca in QEventLoop::exec (this=0xbf8c5a84, flags=...) at kernel/qeventloop.cpp:201
#36 0x00c9453f in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#37 0x0107ddd7 in QApplication::exec () at kernel/qapplication.cpp:3525
#38 0x0804b4e6 in main (argc=1, argv=0xbf8c5d44) at ../../../kontact/src/main.cpp:218

Reported using DrKonqi