Application that crashed: kcmshell4
Version of the application: 
KDE Version: 4.3.2 (KDE 4.3.2)
Qt Version: 4.5.2
Operating System: Linux 2.6.31-16-generic x86_64
Distribution: Ubuntu 9.10

What I was doing when the application crashed:
Go - Show History - Preferences - Clear Hsitory.

 -- Backtrace:
Application: KDE Control Module (kcmshell4), signal: Segmentation fault
[KCrash Handler]
#5  0x00007fa6660ddad7 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/libQtCore.so.4
#6  0x00007fa65c3280bd in ?? () from /usr/lib/kde4/kcm_history.so
#7  0x00007fa65c328444 in ?? () from /usr/lib/kde4/kcm_history.so
#8  0x00007fa6660dcddc in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQtCore.so.4
#9  0x00007fa6659198e7 in QAbstractButton::clicked(bool) () from /usr/lib/libQtGui.so.4
#10 0x00007fa66567b41b in ?? () from /usr/lib/libQtGui.so.4
#11 0x00007fa66567d02b in ?? () from /usr/lib/libQtGui.so.4
#12 0x00007fa66567d275 in QAbstractButton::mouseReleaseEvent(QMouseEvent*) () from /usr/lib/libQtGui.so.4
#13 0x00007fa6653669c0 in QWidget::event(QEvent*) () from /usr/lib/libQtGui.so.4
#14 0x00007fa665317efc in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#15 0x00007fa66531f011 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#16 0x00007fa666cdbab6 in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#17 0x00007fa6660c7c2c in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#18 0x00007fa66531e8e0 in QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&) () from /usr/lib/libQtGui.so.4
#19 0x00007fa665384a0e in ?? () from /usr/lib/libQtGui.so.4
#20 0x00007fa665383aa9 in QApplication::x11ProcessEvent(_XEvent*) () from /usr/lib/libQtGui.so.4
#21 0x00007fa6653acd0c in ?? () from /usr/lib/libQtGui.so.4
#22 0x00007fa661b85bce in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#23 0x00007fa661b89598 in ?? () from /lib/libglib-2.0.so.0
#24 0x00007fa661b896c0 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#25 0x00007fa6660f01a6 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#26 0x00007fa6653ac4be in ?? () from /usr/lib/libQtGui.so.4
#27 0x00007fa6660c6532 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#28 0x00007fa6660c6904 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#29 0x00007fa6657929de in QDialog::exec() () from /usr/lib/libQtGui.so.4
#30 0x00007fa667336058 in kdemain () from /usr/lib/libkdeinit4_kcmshell4.so
#31 0x00007fa66467babd in __libc_start_main () from /lib/libc.so.6
#32 0x0000000000400709 in _start ()

Reported using DrKonqi