Version:           1.9.1 (using KDE 3.5.1, Debian Package 4:3.5.1-4 (testing/unstable))
Compiler:          Target: i486-linux-gnu
OS:                Linux (i686) release 2.6.15.6-kanotix-1

This crash happened, when I was deleting a subfolder of the local trash folder, here is the backtrace:

(no debugging symbols found)
Using host libthread_db library "/lib/tls/libthread_db.so.1".
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
[Thread debugging using libthread_db enabled]
[New Thread -1249294656 (LWP 3261)]
[New Thread -1281307728 (LWP 3377)]
[New Thread -1272919120 (LWP 3376)]
[New Thread -1264530512 (LWP 3375)]
[New Thread -1256141904 (LWP 3374)]
[KCrash handler]
#3  0xb73917d5 in QGDict::look_string () from /usr/lib/libqt-mt.so.3
#4  0xb7c14f07 in KMHeaders::msgRemoved () from /usr/lib/libkmailprivate.so
#5  0xb7c161c9 in KMHeaders::qt_invoke () from /usr/lib/libkmailprivate.so
#6  0xb7091b57 in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#7  0xb7c44e7f in KMFolder::msgRemoved () from /usr/lib/libkmailprivate.so
#8  0xb7c48e0d in KMFolder::qt_emit () from /usr/lib/libkmailprivate.so
#9  0xb7091b2e in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#10 0xb7c6299f in FolderStorage::msgRemoved ()
   from /usr/lib/libkmailprivate.so
#11 0xb7c644bb in FolderStorage::take () from /usr/lib/libkmailprivate.so
#12 0xb7d0e37c in KMFolderMaildir::take () from /usr/lib/libkmailprivate.so
#13 0xb7c43a1e in KMFolder::take () from /usr/lib/libkmailprivate.so
#14 0xb7d0b0f5 in KMFolderMaildir::addMsgInternal ()
   from /usr/lib/libkmailprivate.so
#15 0xb7d0ba15 in KMFolderMaildir::addMsg () from /usr/lib/libkmailprivate.so
#16 0xb7c61993 in FolderStorage::moveMsg () from /usr/lib/libkmailprivate.so
#17 0xb7c43b85 in KMFolder::moveMsg () from /usr/lib/libkmailprivate.so
#18 0xb7d8c5fe in KMMoveCommand::execute () from /usr/lib/libkmailprivate.so
#19 0xb7d7ecab in KMCommand::slotPostTransfer ()
   from /usr/lib/libkmailprivate.so
#20 0xb7d852b6 in KMCommand::qt_invoke () from /usr/lib/libkmailprivate.so
#21 0xb7d855ab in KMMenuCommand::qt_invoke () from /usr/lib/libkmailprivate.so
#22 0xb7d85643 in KMMoveCommand::qt_invoke () from /usr/lib/libkmailprivate.so
#23 0xb7d856cb in KMDeleteMsgCommand::qt_invoke ()
   from /usr/lib/libkmailprivate.so
#24 0xb7091b57 in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#25 0xb7d7d8f2 in KMCommand::messagesTransfered ()
   from /usr/lib/libkmailprivate.so
#26 0xb7d84e1d in KMCommand::transferSelectedMsgs ()
   from /usr/lib/libkmailprivate.so
#27 0xb7d85087 in KMCommand::slotStart () from /usr/lib/libkmailprivate.so
#28 0xb7d852c8 in KMCommand::qt_invoke () from /usr/lib/libkmailprivate.so
#29 0xb7d855ab in KMMenuCommand::qt_invoke () from /usr/lib/libkmailprivate.so
#30 0xb7d85643 in KMMoveCommand::qt_invoke () from /usr/lib/libkmailprivate.so
#31 0xb7d856cb in KMDeleteMsgCommand::qt_invoke ()
   from /usr/lib/libkmailprivate.so
#32 0xb7091b57 in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#33 0xb7422055 in QSignal::signal () from /usr/lib/libqt-mt.so.3
#34 0xb70afa40 in QSignal::activate () from /usr/lib/libqt-mt.so.3
#35 0xb70b7354 in QSingleShotTimer::event () from /usr/lib/libqt-mt.so.3
#36 0xb7027698 in QApplication::internalNotify () from /usr/lib/libqt-mt.so.3
#37 0xb70278b6 in QApplication::notify () from /usr/lib/libqt-mt.so.3
#38 0xb772c8ae in KApplication::notify (this=0xbfc489e8, receiver=0x82f8418, 
    event=0xbfc48728) at kapplication.cpp:550
#39 0xb6fb75e5 in QApplication::sendEvent () from /usr/lib/libqt-mt.so.3
#40 0xb701898c in QEventLoop::activateTimers () from /usr/lib/libqt-mt.so.3
#41 0xb6fcb35c in QEventLoop::processEvents () from /usr/lib/libqt-mt.so.3
#42 0xb703fda2 in QEventLoop::enterLoop () from /usr/lib/libqt-mt.so.3
#43 0xb703fccb in QEventLoop::exec () from /usr/lib/libqt-mt.so.3
#44 0xb7026225 in QApplication::exec () from /usr/lib/libqt-mt.so.3
#45 0x0804a098 in ?? ()
#46 0xbfc489e8 in ?? ()
#47 0xbfc48bd4 in ?? ()
#48 0x00000000 in ?? ()