Application that crashed: kontact
Version of the application: 4.3.4
KDE Version: 4.3.4 (KDE 4.3.4)
Qt Version: 4.5.2
Operating System: Linux 2.6.31-19-generic-pae i686
Distribution: Ubuntu 9.10

What I was doing when the application crashed:
Every time I want to open en email in a search, Kmail crash.

This bug is reproducable. 

 -- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
[KCrash Handler]
#6  QString (this=0x10118e50, s=..., number=false) at ../../include/QtCore/../../src/corelib/tools/qstring.h:711
#7  QTextStreamPrivate::putString (this=0x10118e50, s=..., number=false) at io/qtextstream.cpp:933
#8  0xb666d18b in QTextStream::operator<< (this=0x12b6dea0, string=...) at io/qtextstream.cpp:2511
#9  0xb0c26198 in QDebug::operator<< (this=0xaac95d0, it=0x0) at /usr/include/qt4/QtCore/qdebug.h:108
#10 KMail::MessageListView::Core::View::setCurrentMessageItem (this=0xaac95d0, it=0x0) at ../../kmail/messagelistview/core/view.cpp:768
#11 0xb0bcfb24 in KMail::MessageListView::Widget::activateMessageItemByMsgBase (this=0xaaded48, msg=0x10110cb0) at ../../kmail/messagelistview/widget.cpp:276
#12 0xb0bc5ffb in KMail::MessageListView::Pane::activateMessage (this=0xa27fab8, msg=0x10110cb0) at ../../kmail/messagelistview/pane.cpp:604
#13 0xb0a6815a in KMMainWidget::slotSelectMessage (this=0xa3f3200, msg=0x10110cb0) at ../../kmail/kmmainwidget.cpp:3150
#14 0xb09c7a33 in KMail::SearchWindow::slotShowMsg (this=0xbcbd5b8, item=0xfab5ee8) at ../../kmail/searchwindow.cpp:726
#15 0xb09c7f6e in KMail::SearchWindow::qt_metacall (this=0xbcbd5b8, _c=QMetaObject::InvokeMetaMethod, _id=8, _a=0xbfe8c8c4) at ./searchwindow.moc:128
#16 0xb66db263 in QMetaObject::activate (sender=0xd0782d8, from_signal_index=96, to_signal_index=96, argv=0xbfe8c8c4) at kernel/qobject.cpp:3113
#17 0xb66dbec2 in QMetaObject::activate (sender=0xd0782d8, m=0xb7395930, local_signal_index=1, argv=0xbfe8c8c4) at kernel/qobject.cpp:3187
#18 0xb70ecd29 in QTreeWidget::itemClicked (this=0xd0782d8, _t1=0xfab5ee8, _t2=0) at .moc/release-shared/moc_qtreewidget.cpp:201
#19 0xb70f1b22 in QTreeWidgetPrivate::_q_emitItemClicked (this=0xbbfe4b8, index=...) at itemviews/qtreewidget.cpp:2228
#20 0xb70f9791 in QTreeWidget::qt_metacall (this=0xd0782d8, _c=QMetaObject::InvokeMetaMethod, _id=16, _a=0xbfe8ca58) at .moc/release-shared/moc_qtreewidget.cpp:144
#21 0xb09c603a in KMail::MatchListView::qt_metacall (this=0xd0782d8, _c=QMetaObject::InvokeMetaMethod, _id=111, _a=0xbfe8ca58) at ./searchwindow.moc:203
#22 0xb66db263 in QMetaObject::activate (sender=0xd0782d8, from_signal_index=32, to_signal_index=32, argv=0xbfe8ca58) at kernel/qobject.cpp:3113
#23 0xb66dbec2 in QMetaObject::activate (sender=0xd0782d8, m=0xb7394884, local_signal_index=1, argv=0xbfe8ca58) at kernel/qobject.cpp:3187
#24 0xb706d053 in QAbstractItemView::clicked (this=0xd0782d8, _t1=...) at .moc/release-shared/moc_qabstractitemview.cpp:321
#25 0xb707aefa in QAbstractItemView::mouseReleaseEvent (this=0xd0782d8, event=0xbfe8d390) at itemviews/qabstractitemview.cpp:1660
#26 0xb70bf30c in QTreeView::mouseReleaseEvent (this=0xd0782d8, event=0xbfe8d390) at itemviews/qtreeview.cpp:1796
#27 0xb6b7c012 in QWidget::event (this=0xd0782d8, event=0xbfe8d390) at kernel/qwidget.cpp:7549
#28 0xb6f2b633 in QFrame::event (this=0xd0782d8, e=0xbfe8d390) at widgets/qframe.cpp:559
#29 0xb6fca494 in QAbstractScrollArea::viewportEvent (this=0x0, e=0x0) at widgets/qabstractscrollarea.cpp:962
#30 0xb707e087 in QAbstractItemView::viewportEvent (this=0xd0782d8, event=0xbfe8d390) at itemviews/qabstractitemview.cpp:1476
#31 0xb70b9434 in QTreeView::viewportEvent (this=0xd0782d8, event=0xbfe8d390) at itemviews/qtreeview.cpp:1266
#32 0xb6fcca95 in QAbstractScrollAreaPrivate::viewportEvent (this=0xce99fc0, o=0xba13a70, e=0xbfe8d390) at widgets/qabstractscrollarea_p.h:100
#33 QAbstractScrollAreaFilter::eventFilter (this=0xce99fc0, o=0xba13a70, e=0xbfe8d390) at widgets/qabstractscrollarea_p.h:111
#34 0xb66c483a in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=0x9cf3008, receiver=0xba13a70, event=0xbfe8d390) at kernel/qcoreapplication.cpp:726
#35 0xb6b26f2c in QApplicationPrivate::notify_helper (this=0x9cf3008, receiver=0xba13a70, e=0xbfe8d390) at kernel/qapplication.cpp:4052
#36 0xb6b2f033 in QApplication::notify (this=0xbfe8ed74, receiver=0xba13a70, e=0xbfe8d390) at kernel/qapplication.cpp:3758
#37 0xb75771aa in KApplication::notify (this=0xbfe8ed74, receiver=0xba13a70, event=0xbfe8d390) at ../../kdeui/kernel/kapplication.cpp:302
#38 0xb66c56cb in QCoreApplication::notifyInternal (this=0xbfe8ed74, receiver=0xba13a70, event=0xbfe8d390) at kernel/qcoreapplication.cpp:610
#39 0xb6b2df6e in QCoreApplication::sendSpontaneousEvent (receiver=0xba13a70, event=0xbfe8d390, alienWidget=0xba13a70, nativeWidget=0xbcbd5b8, buttonDown=0xb73a1aa0, lastMouseReceiver=...)
    at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:216
#40 QApplicationPrivate::sendMouseEvent (receiver=0xba13a70, event=0xbfe8d390, alienWidget=0xba13a70, nativeWidget=0xbcbd5b8, buttonDown=0xb73a1aa0, lastMouseReceiver=...)
    at kernel/qapplication.cpp:2924
#41 0xb6b9c7c0 in QETWidget::translateMouseEvent (this=0xbcbd5b8, event=0xbfe8e9dc) at kernel/qapplication_x11.cpp:4409
#42 0xb6b9bc4b in QApplication::x11ProcessEvent (this=0xbfe8ed74, event=0xbfe8e9dc) at kernel/qapplication_x11.cpp:3428
#43 0xb6bc8502 in x11EventSourceDispatch (s=0x9cf6800, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#44 0xb49ece88 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#45 0xb49f0730 in ?? () from /lib/libglib-2.0.so.0
#46 0xb49f0863 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#47 0xb66f002c in QEventDispatcherGlib::processEvents (this=0x9ccd9f8, flags=...) at kernel/qeventdispatcher_glib.cpp:327
#48 0xb6bc7be5 in QGuiEventDispatcherGlib::processEvents (this=0x9ccd9f8, flags=...) at kernel/qguieventdispatcher_glib.cpp:202
#49 0xb66c3c79 in QEventLoop::processEvents (this=0xbfe8ecd4, flags=) at kernel/qeventloop.cpp:149
#50 0xb66c40ca in QEventLoop::exec (this=0xbfe8ecd4, flags=...) at kernel/qeventloop.cpp:201
#51 0xb66c653f in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#52 0xb6b26dd7 in QApplication::exec () at kernel/qapplication.cpp:3525
#53 0x0804b4e6 in main (argc=1, argv=0xbfe8ef94) at ../../../kontact/src/main.cpp:218

Reported using DrKonqi