Version:            (using KDE KDE 3.5.5)
Installed from:    Ubuntu Packages
OS:                Linux

I got following from KDE-Crashmanager:

*******Begin************************
(no debugging symbols found)
Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1".
(no debugging symbols found)
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[Thread debugging using libthread_db enabled]
[New Thread -1232288080 (LWP 5809)]
(no debugging symbols found)
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[KCrash handler]
#6  0xb71a60ac in QPixmap::convertToImage () from /usr/lib/libqt-mt.so.3
#7  0xb781d46c in KWin::setIcons () from /usr/lib/libkdecore.so.4
#8  0xb6ca78dd in KMainWindow::setIcon () from /usr/lib/libkdeui.so.4
#9  0xb66d1486 in KonqMainWindow::setIcon ()
   from /usr/lib/libkdeinit_konqueror.so
#10 0xb66dd5b8 in KonqMainWindow::setLocationBarURL ()
   from /usr/lib/libkdeinit_konqueror.so
#11 0xb66dd6d3 in KonqView::setLocationBarURL ()
   from /usr/lib/libkdeinit_konqueror.so
#12 0xb66f909b in KonqViewManager::setActivePart ()
   from /usr/lib/libkdeinit_konqueror.so
#13 0xb66fb4bf in KonqViewManager::clear ()
   from /usr/lib/libkdeinit_konqueror.so
#14 0xb66fb6b2 in KonqMainWindow::stayPreloaded ()
   from /usr/lib/libkdeinit_konqueror.so
#15 0xb66fbae6 in KonqMainWindow::queryExit ()
   from /usr/lib/libkdeinit_konqueror.so
#16 0xb6c7fb90 in KMainWindow::shuttingDown () from /usr/lib/libkdeui.so.4
#17 0xb6de0111 in KMainWindow::qt_invoke () from /usr/lib/libkdeui.so.4
#18 0xb7f28e83 in KParts::MainWindow::qt_invoke ()
   from /usr/lib/libkparts.so.2
#19 0xb671ad63 in KonqMainWindow::qt_invoke ()
   from /usr/lib/libkdeinit_konqueror.so
#20 0xb725b957 in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#21 0xb725c3fc in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#22 0xb78028ec in KApplication::shutDown () from /usr/lib/libkdecore.so.4
#23 0xb78029be in KApplication::xioErrhandler () from /usr/lib/libkdecore.so.4
#24 0xb7802a19 in KApplication::xioErrhandler () from /usr/lib/libkdecore.so.4
#25 0xb6ec8f4d in _XIOError () from /usr/lib/libX11.so.6
#26 0xb6ec9f06 in _XRead () from /usr/lib/libX11.so.6
#27 0xb6ecb87d in _XEventsQueued () from /usr/lib/libX11.so.6
#28 0xb6eb7262 in XPending () from /usr/lib/libX11.so.6
#29 0xb7199360 in QEventLoop::processEvents () from /usr/lib/libqt-mt.so.3
#30 0xb720d25e in QEventLoop::enterLoop () from /usr/lib/libqt-mt.so.3
#31 0xb720d06e in QEventLoop::exec () from /usr/lib/libqt-mt.so.3
#32 0xb71f4731 in QApplication::exec () from /usr/lib/libqt-mt.so.3
#33 0xb67182b4 in kdemain () from /usr/lib/libkdeinit_konqueror.so
#34 0xb7f3d524 in kdeinitmain () from /usr/lib/kde3/konqueror.so
#35 0x0804e4df in ?? ()
#36 0x00000002 in ?? ()
#37 0x080d1c80 in ?? ()
#38 0x00000001 in ?? ()
#39 0x00000000 in ?? ()
**********End*****************

Sorry, I don't know exactly when this happens, I was surfing on http://kubuntu.de/forum so maybe this is a khtml bug?