Application that crashed: kontact
Version of the application: 4.3.0 pre
KDE Version: 4.2.90 (KDE 4.2.90 (KDE 4.3 Beta2))
Qt Version: 4.5.0
Operating System: Linux 2.6.28-13-generic i686
Distribution: Ubuntu 9.04

What I was doing when the application crashed:
I closed Kontact with the X button in the window titlebar. It was on Korganizer at the time. Then it crashed.

This may be a dupe of 188500, I do not know enough to make that decision.

 -- Backtrace:
Application: Kontact (kontact), signal: Aborted
[KCrash Handler]
#6  0xb7fe7430 in __kernel_vsyscall ()
#7  0xb586f6d0 in raise () from /lib/tls/i686/cmov/libc.so.6
#8  0xb5871098 in abort () from /lib/tls/i686/cmov/libc.so.6
#9  0xb58b3633 in ?? () from /lib/tls/i686/cmov/libc.so.6
#10 0xb58b5555 in free () from /lib/tls/i686/cmov/libc.so.6
#11 0xb5b1c08d in qFree (ptr=0xae232c0) at global/qmalloc.cpp:60
#12 0xb6e58616 in KXMLGUI::ContainerNode::unplugActions (this=0xac24b28, state=@0x9fd4d48) at /usr/include/qt4/QtCore/qlist.h:562
#13 0xb6e58aff in KXMLGUI::ContainerNode::destruct (this=0xac24b28, element={<QDomNode> = {impl = 0xbfb01f44}, <No data fields>}, state=@0x9fd4d48)
    at /build/buildd/kde4libs-4.2.90/kdeui/xmlgui/kxmlguifactory_p.cpp:328
#14 0xb6e590af in KXMLGUI::ContainerNode::destructChildren (this=0x9fada70, element=@0xbfb02010, state=@0x9fd4d48) at /build/buildd/kde4libs-4.2.90/kdeui/xmlgui/kxmlguifactory_p.cpp:371
#15 0xb6e58aed in KXMLGUI::ContainerNode::destruct (this=0x9fada70, element={<QDomNode> = {impl = 0xbfb02010}, <No data fields>}, state=@0x9fd4d48)
    at /build/buildd/kde4libs-4.2.90/kdeui/xmlgui/kxmlguifactory_p.cpp:326
#16 0xb6e5300f in KXMLGUIFactory::removeClient (this=0x9f9bd30, client=0xa053190) at /build/buildd/kde4libs-4.2.90/kdeui/xmlgui/kxmlguifactory.cpp:429
#17 0xb7169a5b in KParts::MainWindow::createGUI (this=0x9dc5fc0, part=0x0) at /build/buildd/kde4libs-4.2.90/kparts/mainwindow.cpp:101
#18 0xb7894bb1 in ~MainWindow (this=0x9dc5fc0) at /build/buildd/kdepim-4.2.90/kontact/src/mainwindow.cpp:256
#19 0xb5c24b25 in qDeleteInEventHandler (o=0x6) at kernel/qobject.cpp:3771
#20 0xb5c263cb in QObject::event (this=0x9dc5fc0, e=0xae0b410) at kernel/qobject.cpp:1101
#21 0xb614c440 in QWidget::event (this=0x9dc5fc0, event=0xae0b410) at kernel/qwidget.cpp:7913
#22 0xb65440d7 in QMainWindow::event (this=0x9dc5fc0, event=0xae0b410) at widgets/qmainwindow.cpp:1396
#23 0xb6e01097 in KMainWindow::event (this=0x9dc5fc0, ev=0xae0b410) at /build/buildd/kde4libs-4.2.90/kdeui/widgets/kmainwindow.cpp:1094
#24 0xb6e4658c in KXmlGuiWindow::event (this=0x9dc5fc0, ev=0xae0b410) at /build/buildd/kde4libs-4.2.90/kdeui/xmlgui/kxmlguiwindow.cpp:131
#25 0xb60f5e9c in QApplicationPrivate::notify_helper (this=0x9d5f7a0, receiver=0x9dc5fc0, e=0xae0b410) at kernel/qapplication.cpp:4084
#26 0xb60fe282 in QApplication::notify (this=0xbfb029b8, receiver=0x9dc5fc0, e=0xae0b410) at kernel/qapplication.cpp:4049
#27 0xb6d1be8d in KApplication::notify (this=0xbfb029b8, receiver=0x9dc5fc0, event=0xae0b410) at /build/buildd/kde4libs-4.2.90/kdeui/kernel/kapplication.cpp:302
#28 0xb5c15a3b in QCoreApplication::notifyInternal (this=0xbfb029b8, receiver=0x9dc5fc0, event=0xae0b410) at kernel/qcoreapplication.cpp:602
#29 0xb5c16695 in QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x9d2c948) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#30 0xb5c1688d in QCoreApplication::sendPostedEvents (receiver=0x0, event_type=0) at kernel/qcoreapplication.cpp:1132
#31 0xb5c417ef in postEventSourceDispatch (s=0x9d54f38) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:218
#32 0xb4cdbb88 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#33 0xb4cdf0eb in ?? () from /usr/lib/libglib-2.0.so.0
#34 0xb4cdf268 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#35 0xb5c41438 in QEventDispatcherGlib::processEvents (this=0x9d5d708, flags={i = -1078974328}) at kernel/qeventdispatcher_glib.cpp:323
#36 0xb6197365 in QGuiEventDispatcherGlib::processEvents (this=0x9d5d708, flags={i = -1078974280}) at kernel/qguieventdispatcher_glib.cpp:202
#37 0xb5c1406a in QEventLoop::processEvents (this=0xbfb02930, flags={i = -1078974216}) at kernel/qeventloop.cpp:149
#38 0xb5c144aa in QEventLoop::exec (this=0xbfb02930, flags={i = -1078974152}) at kernel/qeventloop.cpp:200
#39 0xb5c16959 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:880
#40 0xb60f5d17 in QApplication::exec () at kernel/qapplication.cpp:3553
#41 0x0804bfef in main (argc=1, argv=0xbfb02cb4) at /build/buildd/kdepim-4.2.90/kontact/src/main.cpp:218

Reported using DrKonqi