Application that crashed: kontact
Version of the application: 4.3.2
KDE Version: 4.3.2 (KDE 4.3.2)
Qt Version: 4.5.3
Operating System: Linux 2.6.31-trunk-686 i686
Distribution: Debian GNU/Linux unstable (sid)

What I was doing when the application crashed:
I opened KickOff, went to last started applications and click on the Kontact icon. Then it crash.

 -- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
[KCrash Handler]
#6  0xb776a0ec in QString (this=0x8ffd2d8) at /usr/include/qt4/QtCore/qstring.h:711
#7  Kontact::Plugin::identifier (this=0x8ffd2d8) at ../../kontactinterfaces/plugin.cpp:97
#8  0xb77822b9 in Kontact::MainWindow::activatePluginModule (this=0x8972570) at ../../../kontact/src/mainwindow.cpp:303
#9  0xb7782364 in Kontact::MainWindow::setActivePluginModule (this=0x8972570, module=...) at ../../../kontact/src/mainwindow.cpp:281
#10 0x0804aac7 in KontactApp::newInstance (this=0xbfdfb51c) at ../../../kontact/src/main.cpp:147
#11 0xb749b3e6 in KUniqueApplicationAdaptor::newInstance (this=0x8926728, asn_id=..., args=...) at ../../kdeui/kernel/kuniqueapplication.cpp:459
#12 0xb749b482 in KUniqueApplicationAdaptor::qt_metacall (this=0x8926728, _c=QMetaObject::InvokeMetaMethod, _id=0, _a=0xbfdfaa78) at ./kuniqueapplication_p.moc:75
#13 0xb58b4be5 in QDBusConnectionPrivate::deliverCall (this=0x885f4d0, object=0x8926728, msg=..., metaTypes=..., slotIdx=4) at qdbusintegrator.cpp:891
#14 0xb58b5e31 in QDBusConnectionPrivate::activateCall (this=0x885f4d0, object=0x8926728, flags=337, msg=...) at qdbusintegrator.cpp:803
#15 0xb58b6254 in QDBusConnectionPrivate::activateObject (this=0x885f4d0, node=..., msg=..., pathStartPos=16) at qdbusintegrator.cpp:1370
#16 0xb58b673a in QDBusActivateObjectEvent::placeMetaCall (this=0xaaaa2d8) at qdbusintegrator.cpp:1464
#17 0xb6fa15e0 in QObject::event (this=0xbfdfb51c, e=0xaaaa2d8) at kernel/qobject.cpp:1110
#18 0xb6f90b8b in QCoreApplication::event (this=0xbfdfb51c, e=0xaaaa2d8) at kernel/qcoreapplication.cpp:1434
#19 0xb65d62c9 in QApplication::event (this=0xbfdfb51c, e=0xaaaa2d8) at kernel/qapplication.cpp:2317
#20 0xb65d0a94 in QApplicationPrivate::notify_helper (this=0x886ed60, receiver=0xbfdfb51c, e=0xaaaa2d8) at kernel/qapplication.cpp:4065
#21 0xb65d8bee in QApplication::notify (this=0xbfdfb51c, receiver=0xbfdfb51c, e=0xaaaa2d8) at kernel/qapplication.cpp:3605
#22 0xb74940fd in KApplication::notify (this=0xbfdfb51c, receiver=0xbfdfb51c, event=0xaaaa2d8) at ../../kdeui/kernel/kapplication.cpp:302
#23 0xb6f911eb in QCoreApplication::notifyInternal (this=0xbfdfb51c, receiver=0xbfdfb51c, event=0xaaaa2d8) at kernel/qcoreapplication.cpp:610
#24 0xb6f91e2e in QCoreApplication::sendEvent (receiver=0x0, event_type=0, data=0x8847998) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#25 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x8847998) at kernel/qcoreapplication.cpp:1247
#26 0xb6f9200d in QCoreApplication::sendPostedEvents (receiver=0x0, event_type=0) at kernel/qcoreapplication.cpp:1140
#27 0xb6fbc4cf in QCoreApplication::sendPostedEvents (s=0x8868ab8) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:218
#28 postEventSourceDispatch (s=0x8868ab8) at kernel/qeventdispatcher_glib.cpp:276
#29 0xb4a13e98 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#30 0xb4a17623 in ?? () from /lib/libglib-2.0.so.0
#31 0xb4a177a8 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#32 0xb6fbc041 in QEventDispatcherGlib::processEvents (this=0x88476e8, flags=...) at kernel/qeventdispatcher_glib.cpp:407
#33 0xb6670305 in QGuiEventDispatcherGlib::processEvents (this=0x88476e8, flags=...) at kernel/qguieventdispatcher_glib.cpp:202
#34 0xb6f8f83a in QEventLoop::processEvents (this=0xbfdfb390, flags=...) at kernel/qeventloop.cpp:149
#35 0xb6f8fc82 in QEventLoop::exec (this=0xbfdfb390, flags=...) at kernel/qeventloop.cpp:201
#36 0xb6f920d9 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#37 0xb65d0917 in QApplication::exec () at kernel/qapplication.cpp:3525
#38 0x0804bd40 in main (argc=1, argv=0xbfdfb734) at ../../../kontact/src/main.cpp:218

This bug may be a duplicate of or related to bug 210528

Reported using DrKonqi