Version:           3.5.2 (using KDE KDE 3.5.2)
Installed from:    Debian testing/unstable Packages
OS:                Linux

Looks like it's crashing Akregator, but the bug surfaced when I added my google calendar you Kontacts KOrganzier kpart via korganizer --import.

Using host libthread_db library "/lib/tls/libthread_db.so.1".
[Thread debugging using libthread_db enabled]
[New Thread -1510766912 (LWP 5131)]
[New Thread -1566827600 (LWP 6010)]
[New Thread -1550177360 (LWP 5459)]
[New Thread -1541788752 (LWP 5458)]
[New Thread -1533400144 (LWP 5457)]
[New Thread -1525011536 (LWP 5456)]
[KCrash handler]
#27 0xa72c4ccc in QGList::first (this=0x8d0ead8) at tools/qglist.cpp:841
#28 0xa710d34b in QPtrList<QSplitterLayoutStruct>::first (this=0x8d0ead8)
    at qptrlist.h:109
#29 0xa710cfbd in QSplitter::sizes (this=0x8ddbf40)
    at widgets/qsplitter.cpp:1222
#30 0xa3105110 in Akregator::View::saveSettings (this=0x8dc6b08)
    at akregator_view.cpp:420
#31 0xa310530f in Akregator::Part::saveSettings (this=0x6d756c6f)
    at akregator_part.cpp:290
#32 0xa3104276 in Akregator::Part::slotOnShutdown (this=0x8db0d68)
    at akregator_part.cpp:255
#33 0xa3122290 in Akregator::Part::qt_invoke (this=0x8db0d68, _id=16, 
    _o=0xafc30f4c) at akregator_part.moc:222
#34 0xa6fc6678 in QObject::activate_signal (this=0xafc319b0, clist=0x80de5f0, 
    o=0xafc30f4c) at kernel/qobject.cpp:2380
#35 0xa6fc6fdc in QObject::activate_signal (this=0xafc319b0, signal=15)
    at kernel/qobject.cpp:2325
#36 0xa75a2f4c in KApplication::shutDown (this=0x6d756c6f)
    at kapplication.moc:232
#37 0xa75b934b in KApplication::qt_emit (this=0xafc319b0, _id=15, 
    _o=0xafc3105c) at kapplication.moc:270
#38 0xa75b938b in KUniqueApplication::qt_emit (this=0x6d756c6f, 
    _id=1836412015, _o=0x6d756c6f) at kuniqueapplication.moc:96
#39 0xa6fc664c in QObject::activate_signal (this=0xafc319b0, clist=0x80b26f8, 
    o=0xafc3105c) at kernel/qobject.cpp:2378
#40 0xa6fc6fdc in QObject::activate_signal (this=0xafc319b0, signal=3)
    at kernel/qobject.cpp:2325
#41 0xa735079d in QApplication::aboutToQuit (this=0xafc319b0)
    at .moc/debug-shared-mt/moc_qapplication.cpp:106
#42 0xa6f75313 in QEventLoop::enterLoop (this=0x8099f48)
    at kernel/qeventloop.cpp:210
#43 0xa6f5b3b9 in QApplication::enter_loop (this=0xafc319b0)
    at kernel/qapplication.cpp:2793
#44 0xa6a95510 in KIO::NetAccess::enter_loop (this=0xafc311f0)
    at netaccess.cpp:498
#45 0xa6ad1c09 in KIO::NetAccess::synchronousRunInternal (this=0xafc311f0, 
    job=0x8e33818, window=0x6d756c6f, data=0x0, finalURL=0x0, metaData=0x0)
    at netaccess.cpp:479
#46 0xa6b101f1 in KIO::NetAccess::synchronousRun (job=0x6d756c6f, 
    window=0x6d756c6f, data=0x6d756c6f, finalURL=0x6d756c6f, 
    metaData=0x6d756c6f) at netaccess.cpp:277
#47 0xa5b0d288 in KABC::ResourceFile::save (this=0x8ee98f0)
    at resourcefile.cpp:343
#48 0xa61f7256 in KABC::AddressBook::save (this=0x6d756c6f, ticket=0x8dc0e68)
    at addressbook.cpp:379
#49 0xa5ba4a64 in KABCore::save (this=0xa184658) at kabcore.cpp:742
#50 0xa2b98626 in ~KAddressbookPart (this=0x9745f38)
    at /tmp/buildd/kdepim-3.5.2/build-tree/kdepim-3.5.2/kaddressbook/kaddressbook_part.cpp:73
#51 0x0805c8c8 in ~MainWindow (this=0x80adc70) at mainwindow.cpp:190
#52 0xa6fc37cc in QObject::event (this=0x80adc70, e=0xabff760)
    at kernel/qobject.cpp:750
#53 0xa7000b9a in QWidget::event (this=0x80adc70, e=0xabff760)
    at kernel/qwidget.cpp:4678
#54 0xa70d2bfc in QMainWindow::event (this=0x80adc70, e=0xabff760)
    at widgets/qmainwindow.cpp:1687
#55 0xa6f5c87a in QApplication::internalNotify (this=0xafc319b0, 
    receiver=0x80adc70, e=0xabff760) at kernel/qapplication.cpp:2635
#56 0xa6f5d5f5 in QApplication::notify (this=0xafc319b0, receiver=0x80adc70, 
    e=0xabff760) at kernel/qapplication.cpp:2523
#57 0xa766602e in KApplication::notify (this=0xafc319b0, receiver=0x80adc70, 
    event=0xabff760) at kapplication.cpp:550
#58 0xa6eee001 in QApplication::sendEvent (receiver=0x80adc70, 
    event=0xabff760) at qapplication.h:520
#59 0xa6f5dec5 in QApplication::sendPostedEvents (receiver=0x0, event_type=52)
    at kernel/qapplication.cpp:3299
#60 0xa6f75327 in QEventLoop::enterLoop (this=0x8099f48)
    at kernel/qeventloop.cpp:213
#61 0xa6f7517a in QEventLoop::exec (this=0x8099f48)
    at kernel/qeventloop.cpp:145
#62 0xa6f5b38d in QApplication::exec (this=0xafc319b0)
    at kernel/qapplication.cpp:2758
#63 0x0805ae7b in main (argc=1836412015, argv=0x6d756c6f) at main.cpp:177
#64 0xa772aeb0 in __libc_start_main () from /lib/tls/libc.so.6
#65 0x08058561 in _start () at ../sysdeps/i386/elf/start.S:119