Application that crashed: kontact
Version of the application: 4.3.3
KDE Version: 4.3.3 (KDE 4.3.3)
Qt Version: 4.5.2
Operating System: Linux 2.6.31-15-generic i686
Distribution: Ubuntu 9.10

What I was doing when the application crashed:
it is very easy to reproduce, just click on any action (menu item or toolbar button) to close a task while no task exists

 -- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
[KCrash Handler]
#6  0xab333021 in TaskView::save (this=0x0) at ../../ktimetracker/taskview.cpp:665
#7  0xab3503e4 in TimetrackerWidget::closeFile (this=0x9c38bf0) at ../../ktimetracker/timetrackerwidget.cpp:464
#8  0xab3570f2 in TimetrackerWidget::qt_metacall (this=0x9c38bf0, _c=QMetaObject::InvokeMetaMethod, _id=15, _a=0xbfdb1de8) at ./timetrackerwidget.moc:191
#9  0xb6613263 in QMetaObject::activate (sender=0x9b04888, from_signal_index=5, to_signal_index=6, argv=0xbfdb1de8) at kernel/qobject.cpp:3113
#10 0xb66136d8 in QMetaObject::activate (sender=0x9b04888, m=0xb72bbe48, from_local_signal_index=1, to_local_signal_index=2, argv=0xbfdb1de8) at kernel/qobject.cpp:3207
#11 0xb6a539b1 in QAction::triggered (this=0x9b04888, _t1=false) at .moc/release-shared/moc_qaction.cpp:236
#12 0xb6a54f32 in QAction::activate (this=0x9b04888, event=QAction::Trigger) at kernel/qaction.cpp:1160
#13 0xb6ef6f02 in QAction::trigger (this=0xb63c83a0) at ../../include/QtGui/../../src/gui/kernel/qaction.h:203
#14 QToolButton::nextCheckState (this=0xb63c83a0) at widgets/qtoolbutton.cpp:1135
#15 0xb6e11163 in QAbstractButtonPrivate::click (this=0x9b15e48) at widgets/qabstractbutton.cpp:525
#16 0xb6e11431 in QAbstractButton::mouseReleaseEvent (this=0x9a2db88, e=0xbfdb2410) at widgets/qabstractbutton.cpp:1115
#17 0xb6ef73fc in QToolButton::mouseReleaseEvent (this=0x9a2db88, e=0xbfdb2410) at widgets/qtoolbutton.cpp:709
#18 0xb6aaf012 in QWidget::event (this=0x9a2db88, event=0xbfdb2410) at kernel/qwidget.cpp:7549
#19 0xb6e0f3ee in QAbstractButton::event (this=0x9a2db88, e=0xb63c83a0) at widgets/qabstractbutton.cpp:1077
#20 0xb6ef9d9a in QToolButton::event (this=0x9a2db88, event=0xbfdb2410) at widgets/qtoolbutton.cpp:1151
#21 0xb6a59f54 in QApplicationPrivate::notify_helper (this=0x9292138, receiver=0x9a2db88, e=0xbfdb2410) at kernel/qapplication.cpp:4056
#22 0xb6a62033 in QApplication::notify (this=0xbfdb3df4, receiver=0x9a2db88, e=0xbfdb2410) at kernel/qapplication.cpp:3758
#23 0xb74aa14a in KApplication::notify (this=0xbfdb3df4, receiver=0x9a2db88, event=0xbfdb2410) at ../../kdeui/kernel/kapplication.cpp:302
#24 0xb65fd6cb in QCoreApplication::notifyInternal (this=0xbfdb3df4, receiver=0x9a2db88, event=0xbfdb2410) at kernel/qcoreapplication.cpp:610
#25 0xb6a60f6e in QCoreApplication::sendSpontaneousEvent (receiver=0x9a2db88, event=0xbfdb2410, alienWidget=0x9a2db88, nativeWidget=0x9297b80, buttonDown=0xb72d4aa0, lastMouseReceiver=...)
    at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:216
#26 QApplicationPrivate::sendMouseEvent (receiver=0x9a2db88, event=0xbfdb2410, alienWidget=0x9a2db88, nativeWidget=0x9297b80, buttonDown=0xb72d4aa0, lastMouseReceiver=...)
    at kernel/qapplication.cpp:2924
#27 0xb6acf7c0 in QETWidget::translateMouseEvent (this=0x9297b80, event=0xbfdb3a5c) at kernel/qapplication_x11.cpp:4409
#28 0xb6acec4b in QApplication::x11ProcessEvent (this=0xbfdb3df4, event=0xbfdb3a5c) at kernel/qapplication_x11.cpp:3428
#29 0xb6afb502 in x11EventSourceDispatch (s=0x9294068, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#30 0xb4926e78 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#31 0xb492a720 in ?? () from /lib/libglib-2.0.so.0
#32 0xb492a853 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#33 0xb662802c in QEventDispatcherGlib::processEvents (this=0x926a9f8, flags=...) at kernel/qeventdispatcher_glib.cpp:327
#34 0xb6afabe5 in QGuiEventDispatcherGlib::processEvents (this=0x926a9f8, flags=...) at kernel/qguieventdispatcher_glib.cpp:202
#35 0xb65fbc79 in QEventLoop::processEvents (this=0xbfdb3d54, flags=) at kernel/qeventloop.cpp:149
#36 0xb65fc0ca in QEventLoop::exec (this=0xbfdb3d54, flags=...) at kernel/qeventloop.cpp:201
#37 0xb65fe53f in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#38 0xb6a59dd7 in QApplication::exec () at kernel/qapplication.cpp:3525
#39 0x0804b4e6 in main (argc=1, argv=0xbfdb4014) at ../../../kontact/src/main.cpp:218

This bug may be a duplicate of or related to bug 213825

Reported using DrKonqi