Application that crashed: kontact
Version of the application: 4.3.0 rc2
KDE Version: 4.2.96 (KDE 4.2.96 (KDE 4.3 RC2))
Qt Version: 4.5.2
Operating System: Linux 2.6.30-8-generic x86_64
Distribution: Ubuntu karmic (development branch)

What I was doing when the application crashed:
I removed one of the two seemingly identical vcf(?) files that were part of the akonadi contacts resource, then clicked the Ok and it crashed.

 -- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
[KCrash Handler]
#5  QString (this=0x830000000b) at /usr/include/qt4/QtCore/qstring.h:711
#6  KRES::Resource::identifier (this=0x830000000b) at ../../kresources/resource.cpp:161
#7  0x00007fac96478dbf in KRES::ManagerImpl::writeResourceConfig (this=0x210bd20, resource=0x830000000b, checkActive=true) at ../../kresources/managerimpl.cpp:385
#8  0x00007fac96479438 in KRES::ManagerImpl::change (this=0x7fff91349d30, resource=0x830000000b) at ../../kresources/managerimpl.cpp:215
#9  0x00007fac72ebf68c in KRES::Manager<KABC::Resource>::change (this=0xf06de0) at /usr/include/kresources/manager.h:304
#10 ResourceSelection::edit (this=0xf06de0) at ../../../kaddressbook/features/resourceselection.cpp:208
#11 0x00007fac72ec119c in ResourceSelection::qt_metacall (this=0xf06de0, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fff91349fd0) at ./resourceselection.moc:82
#12 0x00007fac98ed1e1c in QMetaObject::activate (sender=0xf1a300, from_signal_index=<value optimized out>, to_signal_index=<value optimized out>, argv=0x396c290) at kernel/qobject.cpp:3113
#13 0x00007fac99dd7c67 in QAbstractButton::clicked (this=0x7fff91349d30, _t1=false) at .moc/release-shared/moc_qabstractbutton.cpp:200
#14 0x00007fac99b397fb in QAbstractButtonPrivate::emitClicked (this=0x2dc7840) at widgets/qabstractbutton.cpp:543
#15 0x00007fac99b3b40b in QAbstractButtonPrivate::click (this=0x2dc7840) at widgets/qabstractbutton.cpp:536
#16 0x00007fac99b3b655 in QAbstractButton::mouseReleaseEvent (this=0xf1a300, e=0x7fff9134a700) at widgets/qabstractbutton.cpp:1115
#17 0x00007fac99c0a0ca in QToolButton::mouseReleaseEvent (this=0x7fff91349d30, e=0x830000000b) at widgets/qtoolbutton.cpp:709
#18 0x00007fac99825070 in QWidget::event (this=0xf1a300, event=0x7fff9134a700) at kernel/qwidget.cpp:7549
#19 0x00007fac997d662c in QApplicationPrivate::notify_helper (this=0xeb6920, receiver=0xf1a300, e=0x7fff9134a700) at kernel/qapplication.cpp:4056
#20 0x00007fac997dd741 in QApplication::notify (this=<value optimized out>, receiver=0xf1a300, e=0x7fff9134a700) at kernel/qapplication.cpp:3758
#21 0x00007fac9a40c3f6 in KApplication::notify (this=0x7fff9134c620, receiver=0xf1a300, event=0x7fff9134a700) at ../../kdeui/kernel/kapplication.cpp:302
#22 0x00007fac98ebcc6c in QCoreApplication::notifyInternal (this=0x7fff9134c620, receiver=0xf1a300, event=0x7fff9134a700) at kernel/qcoreapplication.cpp:610
#23 0x00007fac997dd010 in QCoreApplication::sendSpontaneousEvent (receiver=0xf1a300, event=0x7fff9134a700, alienWidget=0xf1a300, nativeWidget=0xeb5f30, buttonDown=<value optimized out>, 
    lastMouseReceiver=<value optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:216
#24 QApplicationPrivate::sendMouseEvent (receiver=0xf1a300, event=0x7fff9134a700, alienWidget=0xf1a300, nativeWidget=0xeb5f30, buttonDown=<value optimized out>, 
    lastMouseReceiver=<value optimized out>) at kernel/qapplication.cpp:2924
#25 0x00007fac9984307e in QETWidget::translateMouseEvent (this=0xeb5f30, event=<value optimized out>) at kernel/qapplication_x11.cpp:4409
#26 0x00007fac99842119 in QApplication::x11ProcessEvent (this=<value optimized out>, event=0x7fff9134c230) at kernel/qapplication_x11.cpp:3550
#27 0x00007fac9986b31c in x11EventSourceDispatch (s=<value optimized out>, callback=<value optimized out>, user_data=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:146
#28 0x00007fac92cc69fe in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#29 0x00007fac92cca3c8 in ?? () from /usr/lib/libglib-2.0.so.0
#30 0x00007fac92cca4f0 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#31 0x00007fac98ee51f6 in QEventDispatcherGlib::processEvents (this=0xe86ae0, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:327
#32 0x00007fac9986aace in QGuiEventDispatcherGlib::processEvents (this=0x7fff91349d30, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#33 0x00007fac98ebb572 in QEventLoop::processEvents (this=<value optimized out>, flags=) at kernel/qeventloop.cpp:149
#34 0x00007fac98ebb944 in QEventLoop::exec (this=0x7fff9134c560, flags=) at kernel/qeventloop.cpp:201
#35 0x00007fac98ebdaf9 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#36 0x0000000000403f27 in main (argc=<value optimized out>, argv=<value optimized out>) at ../../../kontact/src/main.cpp:218

Reported using DrKonqi