Version:           4.2.2 (KDE 4.2.2) (using 4.2.2 (KDE 4.2.2), Kubuntu packages)
Compiler:          cc
OS:                Linux (x86_64) release 2.6.28-11-server

Whilst shutting down Ubuntu the following error was displayed:
Application: Jockey (), signal SIGSEGV
0x00007fb4f0242cf0 in nanosleep () from /lib/libc.so.6

Thread 1 (Thread 0x7fb4f11d66f0 (LWP 3612)):
[KCrash Handler]
#5  0x00007fb4ed6486d4 in QWidget::metric () from /usr/lib/libQtGui.so.4
#6  0x00007fb4ed7c1b1a in QFont::QFont () from /usr/lib/libQtGui.so.4
#7  0x00007fb4ed60a3c4 in QWidgetPrivate::updateFont () from /usr/lib/libQtGui.so.4
#8  0x00007fb4ed60a2fc in QWidgetPrivate::resolveFont () from /usr/lib/libQtGui.so.4
#9  0x00007fb4ed615188 in QWidget::setParent () from /usr/lib/libQtGui.so.4
#10 0x00007fb4ed615592 in QWidget::setParent () from /usr/lib/libQtGui.so.4
#11 0x00007fb4ed61ad46 in QWidgetAction::releaseWidget () from /usr/lib/libQtGui.so.4
#12 0x00007fb4ed9eaf2f in QMenu::~QMenu () from /usr/lib/libQtGui.so.4
#13 0x00007fb4e85cb11b in KMenu::~KMenu () from /usr/lib/libkdeui.so.5
#14 0x00007fb4e8577fc3 in KSystemTrayIcon::~KSystemTrayIcon () from /usr/lib/libkdeui.so.5
#15 0x00007fb4e8cc698e in sipKSystemTrayIcon::~sipKSystemTrayIcon () from /usr/lib/python2.6/dist-packages/PyKDE4/kdeui.so
#16 0x00007fb4efaf3191 in QObjectPrivate::deleteChildren () from /usr/lib/libQtCore.so.4
#17 0x00007fb4ed60cbc2 in QWidget::~QWidget () from /usr/lib/libQtGui.so.4
#18 0x00007fb4ee54254e in ?? () from /usr/lib/python2.6/dist-packages/PyQt4/QtGui.so
#19 0x00007fb4ee4e8d18 in ?? () from /usr/lib/python2.6/dist-packages/PyQt4/QtGui.so
#20 0x00007fb4ee95a376 in ?? () from /usr/lib/python2.6/dist-packages/sip.so
#21 0x0000000000469bd5 in ?? ()
#22 0x000000000044d0f3 in ?? ()
#23 0x0000000000469c6b in ?? ()
#24 0x000000000044b967 in ?? ()
#25 0x000000000044df0d in PyDict_SetItem ()
#26 0x000000000044fc31 in _PyModule_Clear ()
#27 0x00000000004b77d6 in PyImport_Cleanup ()
#28 0x00000000004c44ad in Py_Finalize ()
#29 0x00000000004c3f1a in ?? ()
#30 0x00000000004c411d in PyErr_PrintEx ()
#31 0x00000000004c4ec7 in PyRun_SimpleFileExFlags ()
#32 0x00000000004189ce in Py_Main ()
#33 0x00007fb4f01b95a6 in __libc_start_main () from /lib/libc.so.6
#34 0x0000000000417ae9 in _start ()