Application that crashed: kontact
Version of the application: 4.3.2
KDE Version: 4.3.2 (KDE 4.3.2)
Qt Version: 4.5.2
Operating System: Linux 2.6.28-16-generic i686
Distribution: Ubuntu 9.04

What I was doing when the application crashed:
I tried to close KMail after being not able to open new massages on an imap folder (gmail). I was notified about these messages by KMail, they were downloaded (about 15 MB) -- at least KMail showed 100% of progress -- but didn't showed them, attempting to download each of them again (such situation also happened before). So I tried to close KMail, but it crashed instead.

 -- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
[KCrash Handler]
#6  Kontact::Plugin::identifier (this=0x6f006d) at /usr/include/qt4/QtCore/qstring.h:711
#7  0xb7929ff9 in Kontact::MainWindow::activatePluginModule (this=0x81e48f8) at /build/buildd/kdepim-4.3.2/kontact/src/mainwindow.cpp:303
#8  0xb792a0a4 in Kontact::MainWindow::setActivePluginModule (this=0x81e48f8, module=@0xbf9cfa94) at /build/buildd/kdepim-4.3.2/kontact/src/mainwindow.cpp:281
#9  0x0804ac57 in KontactApp::newInstance (this=0xbf9d05f8) at /build/buildd/kdepim-4.3.2/kontact/src/main.cpp:147
#10 0xb6dc5b06 in KUniqueApplicationAdaptor::newInstance (this=0x81ecb88, asn_id=@0x82a0fb0, args=@0x82a11a8) at /build/buildd/kde4libs-4.3.2/kdeui/kernel/kuniqueapplication.cpp:459
#11 0xb6dc5bae in KUniqueApplicationAdaptor::qt_metacall (this=0x81ecb88, _c=QMetaObject::InvokeMetaMethod, _id=0, _a=0xbf9cfce8)
    at /build/buildd/kde4libs-4.3.2/obj-i486-linux-gnu/kdeui/kuniqueapplication_p.moc:75
#12 0xb5e18e5a in QDBusConnectionPrivate::deliverCall (this=0x81d1f48, object=0x81ecb88, msg=@0x86c2c38, metaTypes=@0x93019f4, slotIdx=4) at qdbusintegrator.cpp:891
#13 0xb5e1a179 in QDBusConnectionPrivate::activateCall (this=0x81d1f48, object=0x81ecb88, flags=337, msg=@0x86c2c38) at qdbusintegrator.cpp:803
#14 0xb5e1a5e1 in QDBusConnectionPrivate::activateObject (this=0x81d1f48, node=@0x86c2c24, msg=@0x86c2c38, pathStartPos=16) at qdbusintegrator.cpp:1370
#15 0xb5e1aada in QDBusActivateObjectEvent::placeMetaCall (this=0x86c2bf8) at qdbusintegrator.cpp:1464
#16 0xb5d113b0 in QObject::event (this=0xbf9d05f8, e=0x86c2bf8) at kernel/qobject.cpp:1111
#17 0xb5d0056b in QCoreApplication::event (this=0xbf9d05f8, e=0x86c2bf8) at kernel/qcoreapplication.cpp:1434
#18 0xb61ca679 in QApplication::event (this=0xbf9d05f8, e=0x86c2bf8) at kernel/qapplication.cpp:2317
#19 0xb61c4d3c in QApplicationPrivate::notify_helper (this=0x81d8af8, receiver=0xbf9d05f8, e=0x86c2bf8) at kernel/qapplication.cpp:4056
#20 0xb61cd03e in QApplication::notify (this=0xbf9d05f8, receiver=0xbf9d05f8, e=0x86c2bf8) at kernel/qapplication.cpp:3603
#21 0xb6dbe49d in KApplication::notify (this=0xbf9d05f8, receiver=0xbf9d05f8, event=0x86c2bf8) at /build/buildd/kde4libs-4.3.2/kdeui/kernel/kapplication.cpp:302
#22 0xb5d00bcb in QCoreApplication::notifyInternal (this=0xbf9d05f8, receiver=0xbf9d05f8, event=0x86c2bf8) at kernel/qcoreapplication.cpp:610
#23 0xb5d01825 in QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x81ba440) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#24 0xb5d01a1d in QCoreApplication::sendPostedEvents (receiver=0x0, event_type=0) at kernel/qcoreapplication.cpp:1140
#25 0xb5d2c6af in postEventSourceDispatch (s=0x81e0f28) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:218
#26 0xb4dd1b88 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#27 0xb4dd50eb in ?? () from /usr/lib/libglib-2.0.so.0
#28 0xb4dd5268 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#29 0xb5d2c2f8 in QEventDispatcherGlib::processEvents (this=0x81ba028, flags={i = -1080228664}) at kernel/qeventdispatcher_glib.cpp:327
#30 0xb6266a75 in QGuiEventDispatcherGlib::processEvents (this=0x81ba028, flags={i = -1080228616}) at kernel/qguieventdispatcher_glib.cpp:202
#31 0xb5cff1fa in QEventLoop::processEvents (this=0xbf9d0570, flags={i = -1080228552}) at kernel/qeventloop.cpp:149
#32 0xb5cff642 in QEventLoop::exec (this=0xbf9d0570, flags={i = -1080228488}) at kernel/qeventloop.cpp:201
#33 0xb5d01ae9 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#34 0xb61c4bb7 in QApplication::exec () at kernel/qapplication.cpp:3525
#35 0x0804bfef in main (argc=1, argv=0xbf9d08f4) at /build/buildd/kdepim-4.3.2/kontact/src/main.cpp:218

Reported using DrKonqi