Application that crashed: kontact
Version of the application: 4.3.0
KDE Version: 4.3.00 (KDE 4.3.0)
Qt Version: 4.5.2
Operating System: Linux 2.6.28-15-generic i686
Distribution: Ubuntu 9.04

What I was doing when the application crashed:
When looking at the prefences of "Summary" Kontact crashes. It's the first time this happend.

 -- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
[KCrash Handler]
#5  0xb72233ec in KCal::IncidenceBase::uid () from /usr/lib/libkcal.so.4
#6  0xb72a9669 in KCal::ResourceCached::clearChange () from /usr/lib/libkcal.so.4
#7  0xaa049344 in KCal::ResourceRemote::slotSaveJobResult () from /usr/lib/libkcal_resourceremote.so.4
#8  0xaa049857 in KCal::ResourceRemote::qt_metacall () from /usr/lib/libkcal_resourceremote.so.4
#9  0xb5ba21b8 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#10 0xb5ba2e42 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#11 0xb5dc8cb3 in KJob::result () from /usr/lib/libkdecore.so.5
#12 0xb5dc9159 in KJob::emitResult () from /usr/lib/libkdecore.so.5
#13 0xb6ec86b8 in KIO::FileCopyJob::slotResult () from /usr/lib/libkio.so.5
#14 0xb6ec321f in KIO::FileCopyJob::qt_metacall () from /usr/lib/libkio.so.5
#15 0xb5ba21b8 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#16 0xb5ba2e42 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#17 0xb5dc8cb3 in KJob::result () from /usr/lib/libkdecore.so.5
#18 0xb5dc9159 in KJob::emitResult () from /usr/lib/libkdecore.so.5
#19 0xb6ec3c25 in KIO::SimpleJob::slotFinished () from /usr/lib/libkio.so.5
#20 0xb6ec4563 in KIO::TransferJob::slotFinished () from /usr/lib/libkio.so.5
#21 0xb6ec0b0b in KIO::TransferJob::qt_metacall () from /usr/lib/libkio.so.5
#22 0xb5ba21b8 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#23 0xb5ba2e42 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#24 0xb6f89c17 in KIO::SlaveInterface::finished () from /usr/lib/libkio.so.5
#25 0xb6f8d957 in KIO::SlaveInterface::dispatch () from /usr/lib/libkio.so.5
#26 0xb6f8a0f7 in KIO::SlaveInterface::dispatch () from /usr/lib/libkio.so.5
#27 0xb6f7be6d in KIO::Slave::gotInput () from /usr/lib/libkio.so.5
#28 0xb6f7e303 in KIO::Slave::qt_metacall () from /usr/lib/libkio.so.5
#29 0xb5ba21b8 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#30 0xb5ba2e42 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#31 0xb6e881d7 in KIO::Connection::readyRead () from /usr/lib/libkio.so.5
#32 0xb6e89b43 in ?? () from /usr/lib/libkio.so.5
#33 0xb6e89f26 in KIO::Connection::qt_metacall () from /usr/lib/libkio.so.5
#34 0xb5b9b8cb in QMetaCallEvent::placeMetaCall () from /usr/lib/libQtCore.so.4
#35 0xb5b9d3b0 in QObject::event () from /usr/lib/libQtCore.so.4
#36 0xb604dd3c in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#37 0xb605603e in QApplication::notify () from /usr/lib/libQtGui.so.4
#38 0xb6c475cd in KApplication::notify () from /usr/lib/libkdeui.so.5
#39 0xb5b8cbcb in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#40 0xb5b8d825 in QCoreApplicationPrivate::sendPostedEvents () from /usr/lib/libQtCore.so.4
#41 0xb5b8da1d in QCoreApplication::sendPostedEvents () from /usr/lib/libQtCore.so.4
#42 0xb5bb86af in ?? () from /usr/lib/libQtCore.so.4
#43 0xb4c5eb88 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#44 0xb4c620eb in ?? () from /usr/lib/libglib-2.0.so.0
#45 0xb4c62268 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#46 0xb5bb82f8 in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#47 0xb60efa75 in ?? () from /usr/lib/libQtGui.so.4
#48 0xb5b8b1fa in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#49 0xb5b8b642 in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#50 0xb5b8dae9 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#51 0xb604dbb7 in QApplication::exec () from /usr/lib/libQtGui.so.4
#52 0x0804bfef in _start ()

Reported using DrKonqi