Version:           1.9.5 (using KDE KDE 3.5.5)
Installed from:    Debian testing/unstable Packages
OS:                Linux

When I try to delete messages from my IMAP account, KMail crashes. The crash only happens when I activate the "Threaded message list" option in Configure KMAil -> Appearance -> Message List, and regardless of whether the message I delete is in a thread or not. When the crash happens, I get the following 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 -1249335072 (LWP 3454)]
[New Thread -1279853648 (LWP 3459)]
[New Thread -1271460944 (LWP 3458)]
[New Thread -1263068240 (LWP 3457)]
[New Thread -1254675536 (LWP 3456)]
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[KCrash handler]
#9  0xb73a1f2d in QGDict::look_string () from /usr/lib/libqt-mt.so.3
#10 0xb7cc9ff2 in KMHeaders::msgRemoved () from /usr/lib/libkmailprivate.so
#11 0xb7db6209 in KMHeaders::qt_invoke () from /usr/lib/libkmailprivate.so
#12 0xb70aacb3 in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#13 0xb7bd2410 in KMFolder::msgRemoved () from /usr/lib/libkmailprivate.so
#14 0xb7cbf39d in KMFolder::qt_emit () from /usr/lib/libkmailprivate.so
#15 0xb70aac87 in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#16 0xb7bd1520 in FolderStorage::msgRemoved () from /usr/lib/libkmailprivate.so
#17 0xb7d20dcb in FolderStorage::take () from /usr/lib/libkmailprivate.so
#18 0xb7e2f4ee in KMFolderImap::take () from /usr/lib/libkmailprivate.so
#19 0xb7b904be in KMFolder::take () from /usr/lib/libkmailprivate.so
#20 0xb7e055e6 in KMFolderMaildir::addMsgInternal ()
   from /usr/lib/libkmailprivate.so
#21 0xb7e05f25 in KMFolderMaildir::addMsg () from /usr/lib/libkmailprivate.so
#22 0xb7bdf384 in FolderStorage::reallyAddMsg ()
   from /usr/lib/libkmailprivate.so
#23 0xb7d209ac in FolderStorage::qt_invoke () from /usr/lib/libkmailprivate.so
#24 0xb7d20a33 in KMFolderIndex::qt_invoke () from /usr/lib/libkmailprivate.so
#25 0xb7d20a6b in KMFolderMaildir::qt_invoke ()
   from /usr/lib/libkmailprivate.so
#26 0xb70aacb3 in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#27 0xb7bd370e in KMail::FolderJob::messageRetrieved ()
   from /usr/lib/libkmailprivate.so
#28 0xb7d6a256 in KMail::ImapJob::slotGetMessageResult ()
   from /usr/lib/libkmailprivate.so
#29 0xb7e64c85 in KMail::ImapJob::qt_invoke () from /usr/lib/libkmailprivate.so
#30 0xb70aacb3 in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#31 0xb5ad21ee in KIO::Job::result () from /usr/lib/libkio.so.4
#32 0xb5b121dc in KIO::Job::emitResult () from /usr/lib/libkio.so.4
#33 0xb5b25ebe in KIO::SimpleJob::slotFinished () from /usr/lib/libkio.so.4
#34 0xb5b265dd in KIO::TransferJob::slotFinished () from /usr/lib/libkio.so.4
#35 0xb5b11dfa in KIO::TransferJob::qt_invoke () from /usr/lib/libkio.so.4
#36 0xb70aacb3 in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#37 0xb70ab744 in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#38 0xb5acca8c in KIO::SlaveInterface::finished () from /usr/lib/libkio.so.4
#39 0xb5b31e93 in KIO::SlaveInterface::dispatch () from /usr/lib/libkio.so.4
#40 0xb5b2fed8 in KIO::SlaveInterface::dispatch () from /usr/lib/libkio.so.4
#41 0xb5ae0fab in KIO::Slave::gotInput () from /usr/lib/libkio.so.4
#42 0xb5b1fa60 in KIO::Slave::qt_invoke () from /usr/lib/libkio.so.4
#43 0xb70aacb3 in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#44 0xb70ab5ba in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#45 0xb7434a87 in QSocketNotifier::activated () from /usr/lib/libqt-mt.so.3
#46 0xb70cd45e in QSocketNotifier::event () from /usr/lib/libqt-mt.so.3
#47 0xb7042bd6 in QApplication::internalNotify () from /usr/lib/libqt-mt.so.3
#48 0xb70449f3 in QApplication::notify () from /usr/lib/libqt-mt.so.3
#49 0xb776ae0e in KApplication::notify () from /usr/lib/libkdecore.so.4
#50 0xb6fd63d1 in QApplication::sendEvent () from /usr/lib/libqt-mt.so.3
#51 0xb7034f89 in QEventLoop::activateSocketNotifiers ()
   from /usr/lib/libqt-mt.so.3
#52 0xb6fea704 in QEventLoop::processEvents () from /usr/lib/libqt-mt.so.3
#53 0xb705d129 in QEventLoop::enterLoop () from /usr/lib/libqt-mt.so.3
#54 0xb705cf4a in QEventLoop::exec () from /usr/lib/libqt-mt.so.3
#55 0xb704476f in QApplication::exec () from /usr/lib/libqt-mt.so.3
#56 0x0804a094 in ?? ()
#57 0xbfa82124 in ?? ()
#58 0xbfa82310 in ?? ()
#59 0x00000000 in ?? ()
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