Application that crashed: kontact
Version of the application: 4.3.2
KDE Version: 4.3.2 (KDE 4.3.2)
Qt Version: 4.5.3
Operating System: Linux 2.6.31.5-desktop-1mnb x86_64
Distribution: "Mandriva Linux 2010.0"

What I was doing when the application crashed:
1. I move the message from incoming mailbox to another. 2. The MDN dialog was opened. 3. The "move message" dialog was opened and I click to the move option. 4. In MDN dialog I click to the Ignore option - and crash :-(

 -- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
[KCrash Handler]
#5  0x00000000006064a0 in QString::shared_null ()
#6  0x00007f4923b3a713 in ?? () from /usr/lib64/libkmailprivate.so.4
#7  0x00007f4923c0ac15 in ?? () from /usr/lib64/libkmailprivate.so.4
#8  0x00007f4923c1b7fd in ?? () from /usr/lib64/libkmailprivate.so.4
#9  0x00007f4923de11c8 in KMMainWidget::slotMsgSelected () from /usr/lib64/libkmailprivate.so.4
#10 0x00007f4923dfdcf8 in KMMainWidget::qt_metacall () from /usr/lib64/libkmailprivate.so.4
#11 0x00007f493b5a288c in QMetaObject::activate () from /usr/lib64/libQtCore.so.4
#12 0x00007f4923b2322f in ?? () from /usr/lib64/libkmailprivate.so.4
#13 0x00007f4923b2399c in ?? () from /usr/lib64/libkmailprivate.so.4
#14 0x00007f493b5a288c in QMetaObject::activate () from /usr/lib64/libQtCore.so.4
#15 0x00007f4923b2332f in ?? () from /usr/lib64/libkmailprivate.so.4
#16 0x00007f4923f7435f in ?? () from /usr/lib64/libkmailprivate.so.4
#17 0x00007f4923b23e16 in ?? () from /usr/lib64/libkmailprivate.so.4
#18 0x00007f493b5a288c in QMetaObject::activate () from /usr/lib64/libQtCore.so.4
#19 0x00007f493af5d487 in QItemSelectionModel::selectionChanged () from /usr/lib64/libQtGui.so.4
#20 0x00007f493af61de4 in QItemSelectionModel::emitSelectionChanged () from /usr/lib64/libQtGui.so.4
#21 0x00007f493af64e68 in QItemSelectionModel::select () from /usr/lib64/libQtGui.so.4
#22 0x00007f493af4b431 in ?? () from /usr/lib64/libQtGui.so.4
#23 0x00007f493af4c0d9 in QTreeView::setSelection () from /usr/lib64/libQtGui.so.4
#24 0x00007f493af12796 in QAbstractItemView::mousePressEvent () from /usr/lib64/libQtGui.so.4
#25 0x00007f4923f74735 in ?? () from /usr/lib64/libkmailprivate.so.4
#26 0x00007f493aa8ab56 in QWidget::event () from /usr/lib64/libQtGui.so.4
#27 0x00007f493ade4f96 in QFrame::event () from /usr/lib64/libQtGui.so.4
#28 0x00007f493af1738b in QAbstractItemView::viewportEvent () from /usr/lib64/libQtGui.so.4
#29 0x00007f493af4e4d0 in QTreeView::viewportEvent () from /usr/lib64/libQtGui.so.4
#30 0x00007f493b58c9f7 in QCoreApplicationPrivate::sendThroughObjectEventFilters () from /usr/lib64/libQtCore.so.4
#31 0x00007f493aa3c0fc in QApplicationPrivate::notify_helper () from /usr/lib64/libQtGui.so.4
#32 0x00007f493aa43241 in QApplication::notify () from /usr/lib64/libQtGui.so.4
#33 0x00007f493bf162d6 in KApplication::notify () from /usr/lib64/libkdeui.so.5
#34 0x00007f493b58d6ac in QCoreApplication::notifyInternal () from /usr/lib64/libQtCore.so.4
#35 0x00007f493aa42b10 in QApplicationPrivate::sendMouseEvent () from /usr/lib64/libQtGui.so.4
#36 0x00007f493aaa8bae in ?? () from /usr/lib64/libQtGui.so.4
#37 0x00007f493aaa7c4a in QApplication::x11ProcessEvent () from /usr/lib64/libQtGui.so.4
#38 0x00007f493aacfe9c in ?? () from /usr/lib64/libQtGui.so.4
#39 0x00007f4933f4f4ce in g_main_context_dispatch () from /usr/lib64/libglib-2.0.so.0
#40 0x00007f4933f52e98 in ?? () from /usr/lib64/libglib-2.0.so.0
#41 0x00007f4933f52fc0 in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#42 0x00007f493b5b5c73 in QEventDispatcherGlib::processEvents () from /usr/lib64/libQtCore.so.4
#43 0x00007f493aacf64e in ?? () from /usr/lib64/libQtGui.so.4
#44 0x00007f493b58bfe2 in QEventLoop::processEvents () from /usr/lib64/libQtCore.so.4
#45 0x00007f493b58c3b4 in QEventLoop::exec () from /usr/lib64/libQtCore.so.4
#46 0x00007f493b58e569 in QCoreApplication::exec () from /usr/lib64/libQtCore.so.4
#47 0x0000000000403be7 in _start ()

Reported using DrKonqi