Application that crashed: kontact
Version of the application: 4.3.0 rc1
KDE Version: 4.2.95 (KDE 4.2.95 (KDE 4.3 RC1))
Qt Version: 4.5.1
Operating System: Linux 2.6.28-13-generic x86_64
Distribution: Ubuntu 9.04

What I was doing when the application crashed:
Clicked on Kontact in the Kickoff Application Launcher, kontact crashed immediately. 

 -- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
[KCrash Handler]
#5  0x0000000000000000 in ?? ()
#6  0x00007f2b9470ec4a in Kontact::MainWindow::activatePluginModule (this=0x1abac00) at /build/buildd/kdepim-4.2.95a/kontact/src/mainwindow.cpp:304
#7  0x00000000004036a2 in KontactApp::newInstance (this=0x7fff9d793980) at /build/buildd/kdepim-4.2.95a/kontact/src/main.cpp:147
#8  0x00007f2b91c68566 in KUniqueApplicationAdaptor::newInstance (this=0x1b6b7d0, asn_id=<value optimized out>, args=@0x318a210)
    at /build/buildd/kde4libs-4.2.95/kdeui/kernel/kuniqueapplication.cpp:454
#9  0x00007f2b91c685f2 in KUniqueApplicationAdaptor::qt_metacall (this=0x1b6b7d0, _c=QMetaObject::InvokeMetaMethod, _id=-1879420784, _a=0x7fff9d792c20)
    at /build/buildd/kde4libs-4.2.95/obj-x86_64-linux-gnu/kdeui/kuniqueapplication_p.moc:75
#10 0x00007f2b8ffcf433 in QDBusConnectionPrivate::deliverCall (this=0x1a93f00, object=0x1b6b7d0, msg=@0x1dcb3d0, metaTypes=@0x1c009c0, slotIdx=4) at qdbusintegrator.cpp:891
#11 0x00007f2b8ffd0758 in QDBusConnectionPrivate::activateCall (this=0x1a93f00, object=0x1b6b7d0, flags=337, msg=@0x1dcb3d0) at qdbusintegrator.cpp:803
#12 0x00007f2b8ffd0d81 in QDBusConnectionPrivate::activateObject (this=0x1a93f00, node=@0x1dcb3a8, msg=@0x1dcb3d0, pathStartPos=<value optimized out>) at qdbusintegrator.cpp:1352
#13 0x00007f2b8ffd1098 in QDBusActivateObjectEvent::placeMetaCall (this=0x1dcb360) at qdbusintegrator.cpp:1469
#14 0x00007f2b8fcc4f28 in QObject::event (this=0x7fff9d793980, e=0x1dcb360) at kernel/qobject.cpp:1118
#15 0x00007f2b9083731a in QApplication::event (this=0x7fff9d793980, e=0x1dcb360) at kernel/qapplication.cpp:2318
#16 0x00007f2b90831b9d in QApplicationPrivate::notify_helper (this=0x1aacd70, receiver=0x7fff9d793980, e=0x1dcb360) at kernel/qapplication.cpp:4057
#17 0x00007f2b90839dea in QApplication::notify (this=0x7fff9d793980, receiver=0x7fff9d793980, e=0x1dcb360) at kernel/qapplication.cpp:4022
#18 0x00007f2b91c6162b in KApplication::notify (this=0x7fff9d793980, receiver=0x7fff9d793980, event=0x1dcb360) at /build/buildd/kde4libs-4.2.95/kdeui/kernel/kapplication.cpp:302
#19 0x00007f2b8fcb4dfc in QCoreApplication::notifyInternal (this=0x7fff9d793980, receiver=0x7fff9d793980, event=0x1dcb360) at kernel/qcoreapplication.cpp:610
#20 0x00007f2b8fcb5a6a in QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x1a76690) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#21 0x00007f2b8fcde8a3 in postEventSourceDispatch (s=<value optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:218
#22 0x00007f2b8940720a in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#23 0x00007f2b8940a8e0 in ?? () from /usr/lib/libglib-2.0.so.0
#24 0x00007f2b8940aa7c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#25 0x00007f2b8fcde52f in QEventDispatcherGlib::processEvents (this=0x1a75ea0, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:324
#26 0x00007f2b908ca70f in QGuiEventDispatcherGlib::processEvents (this=0x1abac00, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#27 0x00007f2b8fcb36a2 in QEventLoop::processEvents (this=<value optimized out>, flags={i = -1653000032}) at kernel/qeventloop.cpp:149
#28 0x00007f2b8fcb3a6d in QEventLoop::exec (this=0x7fff9d7938e0, flags={i = -1652999952}) at kernel/qeventloop.cpp:200
#29 0x00007f2b8fcb5d34 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#30 0x0000000000404945 in main (argc=1, argv=0x7fff9d794068) at /build/buildd/kdepim-4.2.95a/kontact/src/main.cpp:218

Reported using DrKonqi