Application that crashed: korganizer
Version of the application: 4.3.2
KDE Version: 4.3.2 (KDE 4.3.2)
Qt Version: 4.5.2
Operating System: Linux 2.6.31-20-generic i686
Distribution: Ubuntu 9.10

What I was doing when the application crashed:
Clicked on the event
CTRL + C
clicked to remove the tick of this calendar
CTRL + V
crash

 -- Backtrace:
Application: KOrganizer (korganizer), signal: Segmentation fault
[KCrash Handler]
#6  0x0014e0dc in QString (this=0xaa655c8) at /usr/include/qt4/QtCore/qstring.h:711
#7  KCal::IncidenceBase::uid (this=0xaa655c8) at ../../kcal/incidencebase.cpp:185
#8  0x00e4e419 in KOEventViewer::changeIncidenceDisplay (this=0x9c7f228, incidence=0x9a08e48, action=0) at ../../korganizer/koeventviewer.cpp:136
#9  0x00bb846e in CalendarView::changeIncidenceDisplay (this=0x9ad1908, incidence=0x9a08e48, action=0) at ../../korganizer/calendarview.cpp:786
#10 0x00bc2d23 in CalendarView::incidenceAdded (this=0x9ad1908, incidence=0x9a08e48) at ../../korganizer/calendarview.cpp:659
#11 0x00bc9891 in CalendarView::qt_metacall (this=0x9ad1908, _c=QMetaObject::InvokeMetaMethod, _id=92, _a=0xbff5f248) at ./calendarview.moc:484
#12 0x025b4263 in QMetaObject::activate (sender=0x9d64060, from_signal_index=4, to_signal_index=4, argv=0xbff5f248) at kernel/qobject.cpp:3113
#13 0x025b4ec2 in QMetaObject::activate (sender=0x9d64060, m=0x231e1c, local_signal_index=0, argv=0xbff5f248) at kernel/qobject.cpp:3187
#14 0x00230223 in KOrg::IncidenceChangerBase::incidenceAdded (this=0x9d64060, _t1=0x9a08e48) at ./incidencechangerbase.moc:94
#15 0x00c61f34 in IncidenceChanger::addIncidence (this=0x9d64060, incidence=0x9a08e48, parent=0x9ad1908) at ../../korganizer/incidencechanger.cpp:334
#16 0x00bbd0ab in CalendarView::edit_paste (this=0x9ad1908) at ../../korganizer/calendarview.cpp:919
#17 0x00bc99e0 in CalendarView::qt_metacall (this=0x9ad1908, _c=QMetaObject::InvokeMetaMethod, _id=105, _a=0xbff5f5b8) at ./calendarview.moc:497
#18 0x025b4263 in QMetaObject::activate (sender=0x9de9c18, from_signal_index=5, to_signal_index=6, argv=0xbff5f5b8) at kernel/qobject.cpp:3113
#19 0x025b46d8 in QMetaObject::activate (sender=0x9de9c18, m=0x183ee48, from_local_signal_index=1, to_local_signal_index=2, argv=0xbff5f5b8) at kernel/qobject.cpp:3207
#20 0x00fd69b1 in QAction::triggered (this=0x9de9c18, _t1=false) at .moc/release-shared/moc_qaction.cpp:236
#21 0x00fd7f32 in QAction::activate (this=0x9de9c18, event=QAction::Trigger) at kernel/qaction.cpp:1160
#22 0x00fdaa18 in QAction::event (this=0x0, e=0xbff5f038) at kernel/qaction.cpp:1079
#23 0x007f7eb3 in KAction::event (this=0x9de9c18, event=0xbff5fa08) at ../../kdeui/actions/kaction.cpp:88
#24 0x00fdcf54 in QApplicationPrivate::notify_helper (this=0x99f9dc0, receiver=0x9de9c18, e=0xbff5fa08) at kernel/qapplication.cpp:4056
#25 0x00fe467c in QApplication::notify (this=0xbff61904, receiver=0x9de9c18, e=0xbff5fa08) at kernel/qapplication.cpp:3603
#26 0x008debfa in KApplication::notify (this=0xbff61904, receiver=0x9de9c18, event=0xbff5fa08) at ../../kdeui/kernel/kapplication.cpp:302
#27 0x0259e6cb in QCoreApplication::notifyInternal (this=0xbff61904, receiver=0x9de9c18, event=0xbff5fa08) at kernel/qcoreapplication.cpp:610
#28 0x01015dfd in QCoreApplication::sendEvent (this=0x99f9e60, e=0xbff5fdb4) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#29 QShortcutMap::dispatchEvent (this=0x99f9e60, e=0xbff5fdb4) at kernel/qshortcutmap.cpp:884
#30 0x01017c7e in QShortcutMap::tryShortcutEvent (this=0x99f9e60, o=0xa17db88, e=0xbff5fdb4) at kernel/qshortcutmap.cpp:369
#31 0x00fe5a0d in QApplication::notify (this=0xbff61904, receiver=0xa17db88, e=0xbff5fdb4) at kernel/qapplication.cpp:3645
#32 0x008debfa in KApplication::notify (this=0xbff61904, receiver=0xa17db88, event=0xbff5fdb4) at ../../kdeui/kernel/kapplication.cpp:302
#33 0x0259e6cb in QCoreApplication::notifyInternal (this=0xbff61904, receiver=0xa17db88, event=0xbff5fdb4) at kernel/qcoreapplication.cpp:610
#34 0x00fdde2e in QCoreApplication::sendSpontaneousEvent (receiver=0xa17db88, event=0x0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:216
#35 qt_sendSpontaneousEvent (receiver=0xa17db88, event=0x0) at kernel/qapplication.cpp:4958
#36 0x0107a440 in QKeyMapper::sendKeyEvent (keyWidget=0xa17db88, grab=false, type=QEvent::KeyPress, code=86, modifiers=..., text=..., autorepeat=<value optimized out>, count=<value optimized out>, 
    nativeScanCode=55, nativeVirtualKey=118, nativeModifiers=4) at kernel/qkeymapper_x11.cpp:1861
#37 0x0107c989 in QKeyMapperPrivate::translateKeyEvent (this=0x9a29798, keyWidget=0xa17db88, event=0xbff6159c, grab=56) at kernel/qkeymapper_x11.cpp:1831
#38 0x01050ed7 in QApplication::x11ProcessEvent (this=0xbff61904, event=0xbff6159c) at kernel/qapplication_x11.cpp:3443
#39 0x0107e502 in x11EventSourceDispatch (s=0x9a04108, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#40 0x06dd2e88 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#41 0x06dd6730 in ?? () from /lib/libglib-2.0.so.0
#42 0x06dd6863 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#43 0x025c902c in QEventDispatcherGlib::processEvents (this=0x99d59f8, flags=...) at kernel/qeventdispatcher_glib.cpp:327
#44 0x0107dbe5 in QGuiEventDispatcherGlib::processEvents (this=0x99d59f8, flags=...) at kernel/qguieventdispatcher_glib.cpp:202
#45 0x0259cc79 in QEventLoop::processEvents (this=0xbff61894, flags=) at kernel/qeventloop.cpp:149
#46 0x0259d0ca in QEventLoop::exec (this=0xbff61894, flags=...) at kernel/qeventloop.cpp:201
#47 0x0259f53f in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#48 0x00fdcdd7 in QApplication::exec () at kernel/qapplication.cpp:3525
#49 0x0804ec60 in main (argc=3, argv=0xbff61a64) at ../../korganizer/main.cpp:61

Reported using DrKonqi