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 2.6.28-15-generic i686
Distribution: Ubuntu 9.04

What I was doing when the application crashed:
I entered a new Todo, clicked on the button for the start-time and clicked on OK. It opened a list of calendars from wich i choosed the standard.cal and confirmed. Then kontact closed. A reopening caused a message, that a kontact-instance may be open and so on, but opened with the OK-confirmation. Although kontact saved the new todo-entry, it crashes with every new entry.

 -- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
[KCrash Handler]
#6  KCal::Incidence::addRelation (this=0xa532938, incidence=0xa3935f0) at /usr/include/qt4/QtCore/qlist.h:90
#7  0xb72e2504 in KCal::Incidence::setRelatedTo (this=0xa3935f0, incidence=0xa532938) at /build/buildd/kdepimlibs-4.3.2/kcal/incidence.cpp:506
#8  0xac5e9055 in ?? () from /usr/lib/libkorganizerprivate.so.4
#9  0xac5e92f6 in ?? () from /usr/lib/libkorganizerprivate.so.4
#10 0xac5e3ec9 in ?? () from /usr/lib/libkorganizerprivate.so.4
#11 0xb6c6938c in KDialog::qt_metacall (this=0xa6b3f58, _c=3220034180, _id=33, _a=0xa3935f0) at /build/buildd/kde4libs-4.3.2/obj-i486-linux-gnu/kdeui/kdialog.moc:184
#12 0xb6d2f5fa in KPageDialog::qt_metacall (this=0xa6b3f58, _c=QMetaObject::InvokeMetaMethod, _id=69, _a=0xbfedd4ec) at /build/buildd/kde4libs-4.3.2/obj-i486-linux-gnu/kdeui/kpagedialog.moc:64
#13 0xac5e47aa in ?? () from /usr/lib/libkorganizerprivate.so.4
#14 0xac5e9a1a in ?? () from /usr/lib/libkorganizerprivate.so.4
#15 0xb5c571b8 in QMetaObject::activate (sender=0xa8d8f28, from_signal_index=4, to_signal_index=4, argv=0xbfedd4ec) at kernel/qobject.cpp:3113
#16 0xb5c57e42 in QMetaObject::activate (sender=0xa8d8f28, m=0xb5d33878, local_signal_index=0, argv=0xbfedd4ec) at kernel/qobject.cpp:3187
#17 0xb5c5aab3 in QSignalMapper::mapped (this=0xa8d8f28, _t1=4) at .moc/release-shared/moc_qsignalmapper.cpp:95
#18 0xb5c5b33d in QSignalMapper::map (this=0xa8d8f28, sender=0xaa2f6e0) at kernel/qsignalmapper.cpp:266
#19 0xb5c5b52e in QSignalMapper::map (this=0xa8d8f28) at kernel/qsignalmapper.cpp:257
#20 0xb5c5bdfb in QSignalMapper::qt_metacall (this=0xa8d8f28, _c=QMetaObject::InvokeMetaMethod, _id=4, _a=0xbfedd66c) at .moc/release-shared/moc_qsignalmapper.cpp:81
#21 0xb5c571b8 in QMetaObject::activate (sender=0xaa2f6e0, from_signal_index=29, to_signal_index=30, argv=0xbfedd66c) at kernel/qobject.cpp:3113
#22 0xb5c575f0 in QMetaObject::activate (sender=0xaa2f6e0, m=0xb69800a4, from_local_signal_index=2, to_local_signal_index=3, argv=0xbfedd66c) at kernel/qobject.cpp:3207
#23 0xb6796f91 in QAbstractButton::clicked (this=0xaa2f6e0, _t1=false) at .moc/release-shared/moc_qabstractbutton.cpp:200
#24 0xb64be3e9 in QAbstractButtonPrivate::emitClicked (this=0xa1619b8) at widgets/qabstractbutton.cpp:543
#25 0xb64c0044 in QAbstractButtonPrivate::click (this=0xa1619b8) at widgets/qabstractbutton.cpp:536
#26 0xb64c02d6 in QAbstractButton::mouseReleaseEvent (this=0xaa2f6e0, e=0xbfeddc48) at widgets/qabstractbutton.cpp:1115
#27 0xb615c973 in QWidget::event (this=0xaa2f6e0, event=0xbfeddc48) at kernel/qwidget.cpp:7549
#28 0xb64be28e in QAbstractButton::event (this=0xaa2f6e0, e=0xbfeddc48) at widgets/qabstractbutton.cpp:1077
#29 0xb6569050 in QPushButton::event (this=0xaa2f6e0, e=0xbfeddc48) at widgets/qpushbutton.cpp:662
#30 0xb6105d3c in QApplicationPrivate::notify_helper (this=0x910c580, receiver=0xaa2f6e0, e=0xbfeddc48) at kernel/qapplication.cpp:4056
#31 0xb610e9b1 in QApplication::notify (this=0xbfedf5c8, receiver=0xaa2f6e0, e=0xbfeddc48) at kernel/qapplication.cpp:3758
#32 0xb6cfe49d in KApplication::notify (this=0xbfedf5c8, receiver=0xaa2f6e0, event=0xbfeddc48) at /build/buildd/kde4libs-4.3.2/kdeui/kernel/kapplication.cpp:302
#33 0xb5c41bcb in QCoreApplication::notifyInternal (this=0xbfedf5c8, receiver=0xaa2f6e0, event=0xbfeddc48) at kernel/qcoreapplication.cpp:610
#34 0xb610da1e in QApplicationPrivate::sendMouseEvent (receiver=0xaa2f6e0, event=0xbfeddc48, alienWidget=0xaa2f6e0, nativeWidget=0xa6b3f58, buttonDown=0xb6987aa0, lastMouseReceiver=@0xb6987aa4)
    at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:216
#35 0xb617dcce in QETWidget::translateMouseEvent (this=0xa6b3f58, event=0xbfedf2dc) at kernel/qapplication_x11.cpp:4409
#36 0xb617d085 in QApplication::x11ProcessEvent (this=0xbfedf5c8, event=0xbfedf2dc) at kernel/qapplication_x11.cpp:3428
#37 0xb61a837a in x11EventSourceDispatch (s=0x9115400, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#38 0xb4d12b88 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#39 0xb4d160eb in ?? () from /usr/lib/libglib-2.0.so.0
#40 0xb4d16268 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#41 0xb5c6d2f8 in QEventDispatcherGlib::processEvents (this=0x90ed028, flags={i = -1074924392}) at kernel/qeventdispatcher_glib.cpp:327
#42 0xb61a7a75 in QGuiEventDispatcherGlib::processEvents (this=0x90ed028, flags={i = -1074924344}) at kernel/qguieventdispatcher_glib.cpp:202
#43 0xb5c401fa in QEventLoop::processEvents (this=0xbfedf540, flags={i = -1074924280}) at kernel/qeventloop.cpp:149
#44 0xb5c40642 in QEventLoop::exec (this=0xbfedf540, flags={i = -1074924216}) at kernel/qeventloop.cpp:201
#45 0xb5c42ae9 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#46 0xb6105bb7 in QApplication::exec () at kernel/qapplication.cpp:3525
#47 0x0804bfef in _start ()

This bug may be a duplicate of or related to bug 200970

Reported using DrKonqi