Application that crashed: kmail
Version of the application: 1.12.4
KDE Version: 4.3.4 (KDE 4.3.4)
Qt Version: 4.5.3
Operating System: Linux 2.6.30-2-amd64 x86_64
Distribution: Debian GNU/Linux 5.0.4 (lenny)

What I was doing when the application crashed:
Trying to edit a message in the kmail draft folder. KMail crashes with double click.

 -- Backtrace:
Application: KMail (kmail), signal: Aborted
The current source language is "auto; currently c".
[KCrash Handler]
#27 KMFolderNode::parent (this=0x27b0ae0) at ../../kmail/kmfoldernode.cpp:43
#28 0x00007fdae840a713 in KMFolder::idString (this=0x7fdae6979008) at ../../kmail/kmfolder.cpp:758
#29 0x00007fdae853829b in KMKernel::folderIsDrafts (this=0x7fff4dae91a0, folder=0x7fdae6979008) at ../../kmail/kmkernel.cpp:2031
#30 0x00007fdae871494b in KMail::MessageActions::editCurrentMessage (this=0x3a07b40) at ../../kmail/messageactions.cpp:360
#31 0x00007fdae85f1edc in KMMainWidget::slotMsgActivated (this=0x3477750, msg=0x4ab01f0) at ../../kmail/kmmainwidget.cpp:3355
#32 0x00007fdae860c17c in KMMainWidget::qt_metacall (this=0x3477750, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fff4dae6530) at ./kmmainwidget.moc:361
#33 0x00007fdae7c16df2 in QMetaObject::activate (sender=0x3478820, from_signal_index=<value optimized out>, to_signal_index=69, argv=0x7fff4dae6530) at kernel/qobject.cpp:3112
#34 0x00007fdae8331002 in KMail::MessageListView::Pane::messageActivated (this=0x27b0ae0, _t1=0x4ab01f0) at moc_pane.cpp:133
#35 0x00007fdae833198c in KMail::MessageListView::Pane::qt_metacall (this=0x3478820, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fff4dae6660) at moc_pane.cpp:109
#36 0x00007fdae7c16df2 in QMetaObject::activate (sender=0x347c980, from_signal_index=<value optimized out>, to_signal_index=49, argv=0x7fff4dae6530) at kernel/qobject.cpp:3112
#37 0x00007fdae8330ea2 in KMail::MessageListView::Widget::messageActivated (this=0x27b0ae0, _t1=0x4ab01f0) at moc_widget.cpp:103
#38 0x00007fdae70cb1fe in QWidget::event (this=0x34a2640, event=0x7fff4dae7440) at kernel/qwidget.cpp:7558
#39 0x00007fdae743392b in QFrame::event (this=0x34a2640, e=0x7fff4dae7440) at widgets/qframe.cpp:559
#40 0x00007fdae756598b in QAbstractItemView::viewportEvent (this=0x34a2640, event=0x7fff4dae7440) at itemviews/qabstractitemview.cpp:1476
#41 0x00007fdae759d689 in QTreeView::viewportEvent (this=0x34a2640, event=0x7fff4dae7440) at itemviews/qtreeview.cpp:1266
#42 0x00007fdae7c00fb8 in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=<value optimized out>, receiver=0x34d6660, event=0x7fff4dae7440) at kernel/qcoreapplication.cpp:726
#43 0x00007fdae707afec in QApplicationPrivate::notify_helper (this=0x22fd120, receiver=0x34d6660, e=0x7fff4dae7440) at kernel/qapplication.cpp:4061
#44 0x00007fdae70837ca in QApplication::notify (this=<value optimized out>, receiver=0x34d6660, e=0x7fff4dae7440) at kernel/qapplication.cpp:3767
#45 0x00007fdae92a1e06 in KApplication::notify (this=0x7fff4dae92f0, receiver=0x34d6660, event=0x7fff4dae7440) at ../../kdeui/kernel/kapplication.cpp:302
#46 0x00007fdae7c01c9c in QCoreApplication::notifyInternal (this=0x7fff4dae92f0, receiver=0x34d6660, event=0x7fff4dae7440) at kernel/qcoreapplication.cpp:610
#47 0x00007fdae7082a78 in QCoreApplication::sendSpontaneousEvent (receiver=0x34d6660, event=0x7fff4dae7440, alienWidget=0x34d6660, nativeWidget=0x3477750, buttonDown=<value optimized out>, 
    lastMouseReceiver=...) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:216
#48 QApplicationPrivate::sendMouseEvent (receiver=0x34d6660, event=0x7fff4dae7440, alienWidget=0x34d6660, nativeWidget=0x3477750, buttonDown=<value optimized out>, lastMouseReceiver=...)
    at kernel/qapplication.cpp:2924
#49 0x00007fdae70eb659 in QETWidget::translateMouseEvent (this=0x3477750, event=<value optimized out>) at kernel/qapplication_x11.cpp:4411
#50 0x00007fdae70ea40f in QApplication::x11ProcessEvent (this=0x7fff4dae92f0, event=0x7fff4dae8e10) at kernel/qapplication_x11.cpp:3552
#51 0x00007fdae711276c in x11EventSourceDispatch (s=0x2300a70, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#52 0x00007fdadeb7990e in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#53 0x00007fdadeb7d2c8 in ?? () from /lib/libglib-2.0.so.0
#54 0x00007fdadeb7d3f0 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#55 0x00007fdae7c2a39c in QEventDispatcherGlib::processEvents (this=0x22aab40, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:407
#56 0x00007fdae7111f1f in QGuiEventDispatcherGlib::processEvents (this=0x27b0ae0, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#57 0x00007fdae7c00562 in QEventLoop::processEvents (this=<value optimized out>, flags=...) at kernel/qeventloop.cpp:149
#58 0x00007fdae7c00934 in QEventLoop::exec (this=0x7fff4dae9140, flags=...) at kernel/qeventloop.cpp:201
#59 0x00007fdae7c02ba4 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#60 0x0000000000402fa9 in main (argc=<value optimized out>, argv=<value optimized out>) at ../../kmail/main.cpp:146

Reported using DrKonqi