Version:            (using KDE KDE 3.5.2)
Installed from:    Ubuntu Packages

Scenario:
1. I have run Kontact.
2. I have disable KMail part in preferences.
3. I have started deleting todos from To-Do window.
4. Suddenly Kontact crashed.

Backtrace:

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Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1".
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[Thread debugging using libthread_db enabled]
[New Thread -1241360704 (LWP 9007)]
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[KCrash handler]
#6  0xb566f673 in KMAccount::mailCheck () from /usr/lib/libkmailprivate.so
#7  0xb566f8b7 in KMAccount::qt_invoke () from /usr/lib/libkmailprivate.so
#8  0xb572dfa9 in KMail::NetworkAccount::qt_invoke ()
   from /usr/lib/libkmailprivate.so
#9  0xb5739bbf in KMail::ImapAccountBase::qt_invoke ()
   from /usr/lib/libkmailprivate.so
#10 0xb5741acf in KMAcctImap::qt_invoke () from /usr/lib/libkmailprivate.so
#11 0xb7077e29 in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#12 0xb70788c4 in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#13 0xb740cf1e in QTimer::timeout () from /usr/lib/libqt-mt.so.3
#14 0xb709ce21 in QTimer::event () from /usr/lib/libqt-mt.so.3
#15 0xb700ddc6 in QApplication::internalNotify () from /usr/lib/libqt-mt.so.3
#16 0xb700dfc2 in QApplication::notify () from /usr/lib/libqt-mt.so.3
#17 0xb770cd7d in KApplication::notify () from /usr/lib/libkdecore.so.4
#18 0xb6f9f0ef in QApplication::sendEvent () from /usr/lib/libqt-mt.so.3
#19 0xb6fff7b3 in QEventLoop::activateTimers () from /usr/lib/libqt-mt.so.3
#20 0xb6fb2eff in QEventLoop::processEvents () from /usr/lib/libqt-mt.so.3
#21 0xb70268b7 in QEventLoop::enterLoop () from /usr/lib/libqt-mt.so.3
#22 0xb70267da in QEventLoop::exec () from /usr/lib/libqt-mt.so.3
#23 0xb700c8d5 in QApplication::exec () from /usr/lib/libqt-mt.so.3
#24 0x0805ab01 in ?? ()
#25 0xbfe7b560 in ?? ()
#26 0x00000001 in ?? ()
#27 0x00000001 in ?? ()
#28 0x00000000 in ?? ()