Application that crashed: kontact
Version of the application: 4.3.3
KDE Version: 4.3.3 (KDE 4.3.3)
Qt Version: 4.5.3
Operating System: Linux 2.6.29-gentoo-r5dawierox x86_64

What I was doing when the application crashed:
It happened only once (I have used this version every day for one month), all I was doing was reading emails.

 -- Backtrace:
Application: Kontact (kontact), signal: Aborted
[KCrash Handler]
#5  0x00007fe675420205 in raise () from /lib/libc.so.6
#6  0x00007fe67542157e in abort () from /lib/libc.so.6
#7  0x00007fe676139c99 in qt_message_output (msgType=QtFatalMsg, buf=<value optimized out>) at global/qglobal.cpp:2042
#8  0x00007fe67613a330 in qFatal (msg=<value optimized out>) at global/qglobal.cpp:2241
#9  0x00007fe665f61aee in QVector<KMMsgBase*>::operator[] (this=0xc823b8, i=31) at /usr/include/qt4/QtCore/qvector.h:337
#10 0x00007fe665f819ad in KMFolderIndex::getMsgBase (this=<value optimized out>, idx=8418) at /media/data/CAVE/.portage_tmpdir/portage/kde-base/kmail-4.3.3/work/kmail-4.3.3/kmail/kmfolderindex.h:73
#11 0x00007fe665f0ce43 in FolderStorage::setStatus (this=0x20e2, idx=8418, status=@0x6, toggle=255)
    at /media/data/CAVE/.portage_tmpdir/portage/kde-base/kmail-4.3.3/work/kmail-4.3.3/kmail/folderstorage.cpp:1083
#12 0x00007fe665f0d658 in FolderStorage::setStatus (this=0xc82340, ids=@0x1b693f8, status=@0x1a36c08, toggle=false)
    at /media/data/CAVE/.portage_tmpdir/portage/kde-base/kmail-4.3.3/work/kmail-4.3.3/kmail/folderstorage.cpp:1098
#13 0x00007fe66602bd48 in KMSetStatusCommand::execute (this=0x1a36bc0) at /media/data/CAVE/.portage_tmpdir/portage/kde-base/kmail-4.3.3/work/kmail-4.3.3/kmail/kmcommands.cpp:1678
#14 0x00007fe666036cac in KMCommand::slotPostTransfer (this=0x1a36bc0, result=KMCommand::OK) at /media/data/CAVE/.portage_tmpdir/portage/kde-base/kmail-4.3.3/work/kmail-4.3.3/kmail/kmcommands.cpp:274
#15 0x00007fe666036d81 in KMCommand::qt_metacall (this=0x1a36bc0, _c=QMetaObject::InvokeMetaMethod, _id=5, _a=0x7fff84524160)
    at /media/data/CAVE/.portage_tmpdir/portage/kde-base/kmail-4.3.3/work/kmail-4.3.3_build/kmail/kmcommands.moc:87
#16 0x00007fe67622ec83 in QMetaObject::activate (sender=0x1a36bc0, from_signal_index=<value optimized out>, to_signal_index=4, argv=0xffffffffffffffff) at kernel/qobject.cpp:3101
#17 0x00007fe66602215e in KMCommand::messagesTransfered (this=0x20e2, _t1=KMCommand::OK)
    at /media/data/CAVE/.portage_tmpdir/portage/kde-base/kmail-4.3.3/work/kmail-4.3.3_build/kmail/kmcommands.moc:102
#18 0x00007fe666036acd in KMCommand::transferSelectedMsgs (this=0x1a36bc0) at /media/data/CAVE/.portage_tmpdir/portage/kde-base/kmail-4.3.3/work/kmail-4.3.3/kmail/kmcommands.cpp:368
#19 0x00007fe666037755 in KMCommand::slotStart (this=0x1a36bc0) at /media/data/CAVE/.portage_tmpdir/portage/kde-base/kmail-4.3.3/work/kmail-4.3.3/kmail/kmcommands.cpp:266
#20 0x00007fe666036d8d in KMCommand::qt_metacall (this=0x1a36bc0, _c=QMetaObject::InvokeMetaMethod, _id=4, _a=0x7fff84524390)
    at /media/data/CAVE/.portage_tmpdir/portage/kde-base/kmail-4.3.3/work/kmail-4.3.3_build/kmail/kmcommands.moc:86
#21 0x00007fe67622ec83 in QMetaObject::activate (sender=0x1b67010, from_signal_index=<value optimized out>, to_signal_index=4, argv=0xffffffffffffffff) at kernel/qobject.cpp:3101
#22 0x00007fe676235ccf in QSingleShotTimer::timerEvent (this=0x1b67010) at kernel/qtimer.cpp:298
#23 0x00007fe67622b2d2 in QObject::event (this=0x1b67010, e=0x20e2) at kernel/qobject.cpp:1066
#24 0x00007fe676fcc73e in QApplicationPrivate::notify_helper (this=0x649130, receiver=0x1b67010, e=0x7fff845249e0) at kernel/qapplication.cpp:4065
#25 0x00007fe676fd3b22 in QApplication::notify (this=0x7fff84524ce0, receiver=0x1b67010, e=0x7fff845249e0) at kernel/qapplication.cpp:3961
#26 0x00007fe677db6161 in KApplication::notify (this=0x7fff84524ce0, receiver=0x1b67010, event=0x7fff845249e0)
    at /media/data/CAVE/.portage_tmpdir/portage/kde-base/kdelibs-4.3.3/work/kdelibs-4.3.3/kdeui/kernel/kapplication.cpp:302
#27 0x00007fe67621a913 in QCoreApplication::notifyInternal (this=0x7fff84524ce0, receiver=0x1b67010, event=0x7fff845249e0) at kernel/qcoreapplication.cpp:606
#28 0x00007fe6762458b9 in QTimerInfoList::activateTimers (this=0x635880) at kernel/qcoreapplication.h:213
#29 0x00007fe67624298d in timerSourceDispatch (source=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:165
#30 0x00007fe6715f38b2 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#31 0x00007fe6715f6b8d in ?? () from /usr/lib/libglib-2.0.so.0
#32 0x00007fe6715f708f in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#33 0x00007fe676242e3e in QEventDispatcherGlib::processEvents (this=0x60b960, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:327
#34 0x00007fe677054c3f in QGuiEventDispatcherGlib::processEvents (this=0x20e2, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#35 0x00007fe676219d35 in QEventLoop::processEvents (this=<value optimized out>, flags=@0x7fff84524c10) at kernel/qeventloop.cpp:149
#36 0x00007fe676219eac in QEventLoop::exec (this=0x7fff84524c50, flags=@0x7fff84524c60) at kernel/qeventloop.cpp:197
#37 0x00007fe67621c0a9 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#38 0x0000000000404158 in main (argc=3, argv=0x7fff84525208) at /media/data/CAVE/.portage_tmpdir/portage/kde-base/kontact-4.3.3/work/kontact-4.3.3/kontact/src/main.cpp:218

Reported using DrKonqi