Application that crashed: konqueror
Version of the application: 4.3.2 (KDE 4.3.2)
KDE Version: 4.3.2 (KDE 4.3.2)
Qt Version: 4.5.2
Operating System: Linux 2.6.28-16-generic i686
Distribution: Ubuntu 9.04

What I was doing when the application crashed:
Same behavior - close an additional open tab (second one here) and crash occures. Does not happen all the time.

 -- Backtrace:
Application: Konqueror (kdeinit4), signal: Segmentation fault
[KCrash Handler]
#6  KonqMainWindow::slotPartActivated (this=0x87ef200, part=0x97b53e8) at /build/buildd/kdebase-4.3.2/apps/konqueror/src/konqmainwindow.cpp:1975
#7  0xb49a43e1 in KonqViewManager::emitActivePartChanged (this=0x87df3c0) at /build/buildd/kdebase-4.3.2/apps/konqueror/src/konqviewmanager.cpp:1060
#8  0xb49a451b in KonqViewManager::doSetActivePart (this=0x87df3c0, part=0x97b53e8) at /build/buildd/kdebase-4.3.2/apps/konqueror/src/konqviewmanager.cpp:1031
#9  0xb7ac211b in KParts::PartManager::eventFilter (this=0x87df3c0, obj=0xa6156d8, ev=0xbfc658e8) at /build/buildd/kde4libs-4.3.2/kparts/partmanager.cpp:282
#10 0xb7e58eac in QCoreApplicationPrivate::sendThroughApplicationEventFilters (this=0x87346c8, receiver=0xa6156d8, event=0xbfc658e8) at kernel/qcoreapplication.cpp:707
#11 0xb6915cb3 in QApplicationPrivate::notify_helper (this=0x87346c8, receiver=0xa6156d8, e=0xbfc658e8) at kernel/qapplication.cpp:4031
#12 0xb691e122 in QApplication::notify (this=0xbfc66660, receiver=0xa6156d8, e=0xbfc658e8) at kernel/qapplication.cpp:4021
#13 0xb742649d in KApplication::notify (this=0xbfc66660, receiver=0xa6156d8, event=0xbfc658e8) at /build/buildd/kde4libs-4.3.2/kdeui/kernel/kapplication.cpp:302
#14 0xb7e59bcb in QCoreApplication::notifyInternal (this=0xbfc66660, receiver=0xa6156d8, event=0xbfc658e8) at kernel/qcoreapplication.cpp:610
#15 0xb6920ede in QCoreApplication::sendEvent (receiver=0xa6156d8, event=0x8bfaba8) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#16 0xb691c876 in QApplicationPrivate::setFocusWidget (focus=0xa6156d8, reason=Qt::TabFocusReason) at kernel/qapplication.cpp:2097
#17 0xb696644e in QWidget::setFocus (this=0xa6156d8, reason=Qt::TabFocusReason) at kernel/qwidget.cpp:5747
#18 0xb6966757 in QWidget::focusNextPrevChild (this=0x87ef200, next=true) at kernel/qwidget.cpp:5891
#19 0xb69666f3 in QWidget::focusNextPrevChild (this=0x8af6b50, next=168) at kernel/qwidget.cpp:5883
#20 0xb69666f3 in QWidget::focusNextPrevChild (this=0x8af5130, next=168) at kernel/qwidget.cpp:5883
#21 0xb69666f3 in QWidget::focusNextPrevChild (this=0x9f552c0, next=168) at kernel/qwidget.cpp:5883
#22 0xb69666f3 in QWidget::focusNextPrevChild (this=0x97a81a8, next=168) at kernel/qwidget.cpp:5883
#23 0xb69666f3 in QWidget::focusNextPrevChild (this=0x8e011b8, next=168) at kernel/qwidget.cpp:5883
#24 0xb224da8c in KHTMLView::focusNextPrevChild (this=0x8e011b8, next=true) at /build/buildd/kde4libs-4.3.2/khtml/khtmlview.cpp:2014
#25 0xb696ad92 in QWidgetPrivate::hide_helper (this=0x90e4f10) at kernel/qwidget.cpp:6855
#26 0xb69726f0 in QWidget::setVisible (this=0x8e011b8, visible=false) at kernel/qwidget.cpp:7012
#27 0xb227edc4 in ~KHTMLPart (this=0x97b53e8) at /usr/include/qt4/QtGui/qwidget.h:477
#28 0xb499df08 in ~KonqView (this=0x9b9d280) at /build/buildd/kdebase-4.3.2/apps/konqueror/src/konqview.cpp:132
#29 0xb49a4c24 in KonqViewManager::removeTab (this=0x87df3c0, currentFrame=0x9f552d4, emitAboutToRemoveSignal=true) at /build/buildd/kdebase-4.3.2/apps/konqueror/src/konqviewmanager.cpp:400
#30 0xb49d7e25 in KonqMainWindow::slotRemoveTabPopupDelayed (this=0x87ef200) at /build/buildd/kdebase-4.3.2/apps/konqueror/src/konqmainwindow.cpp:2559
#31 0xb49ffccc in KonqMainWindow::qt_metacall (this=0x87ef200, _c=QMetaObject::InvokeMetaMethod, _id=82, _a=0xbfc65d78)
    at /build/buildd/kdebase-4.3.2/obj-i486-linux-gnu/apps/konqueror/src/konqmainwindow.moc:417
#32 0xb7e6f1b8 in QMetaObject::activate (sender=0x94e5e38, from_signal_index=4, to_signal_index=4, argv=0x0) at kernel/qobject.cpp:3113
#33 0xb7e6fe42 in QMetaObject::activate (sender=0x94e5e38, m=0xb7f4b908, local_signal_index=0, argv=0x0) at kernel/qobject.cpp:3187
#34 0xb7e74f77 in QSingleShotTimer::timeout (this=0x94e5e38) at .moc/release-shared/qtimer.moc:76
#35 0xb7e7509c in QSingleShotTimer::timerEvent (this=0x94e5e38) at kernel/qtimer.cpp:298
#36 0xb7e6a16f in QObject::event (this=0x94e5e38, e=0xbfc661fc) at kernel/qobject.cpp:1075
#37 0xb6915d3c in QApplicationPrivate::notify_helper (this=0x87346c8, receiver=0x94e5e38, e=0xbfc661fc) at kernel/qapplication.cpp:4056
#38 0xb691e03e in QApplication::notify (this=0xbfc66660, receiver=0x94e5e38, e=0xbfc661fc) at kernel/qapplication.cpp:3603
#39 0xb742649d in KApplication::notify (this=0xbfc66660, receiver=0x94e5e38, event=0xbfc661fc) at /build/buildd/kde4libs-4.3.2/kdeui/kernel/kapplication.cpp:302
#40 0xb7e59bcb in QCoreApplication::notifyInternal (this=0xbfc66660, receiver=0x94e5e38, event=0xbfc661fc) at kernel/qcoreapplication.cpp:610
#41 0xb7e88d51 in QTimerInfoList::activateTimers (this=0x87368f4) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#42 0xb7e853a0 in timerSourceDispatch (source=0x87368c0) at kernel/qeventdispatcher_glib.cpp:165
#43 0xb64c8b88 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#44 0xb64cc0eb in ?? () from /usr/lib/libglib-2.0.so.0
#45 0xb64cc268 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#46 0xb7e852f8 in QEventDispatcherGlib::processEvents (this=0x86c3d40, flags={i = -1077517448}) at kernel/qeventdispatcher_glib.cpp:327
#47 0xb69b7a75 in QGuiEventDispatcherGlib::processEvents (this=0x86c3d40, flags={i = -1077517400}) at kernel/qguieventdispatcher_glib.cpp:202
#48 0xb7e581fa in QEventLoop::processEvents (this=0xbfc66420, flags={i = -1077517336}) at kernel/qeventloop.cpp:149
#49 0xb7e58642 in QEventLoop::exec (this=0xbfc66420, flags={i = -1077517272}) at kernel/qeventloop.cpp:201
#50 0xb7e5aae9 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#51 0xb6915bb7 in QApplication::exec () at kernel/qapplication.cpp:3525
#52 0xb4a308a8 in kdemain (argc=2, argv=0x86c14c8) at /build/buildd/kdebase-4.3.2/apps/konqueror/src/konqmain.cpp:271
#53 0x0804e27d in launch (argc=2, _name=0x86fc10c "/usr/bin/konqueror", args=0x86fc127 "", cwd=0x0, envc=0, envs=0x86fc12c "", reset_env=false, tty=0x0, avoid_loops=false, 
    startup_id_str=0x86fc130 "myotherbrain;1260007979;538741;3336_TIME103255") at /build/buildd/kde4libs-4.3.2/kinit/kinit.cpp:677
#54 0x0804ea5d in handle_launcher_request (sock=7, who=<value optimized out>) at /build/buildd/kde4libs-4.3.2/kinit/kinit.cpp:1169
#55 0x0804efe5 in handle_requests (waitForPid=0) at /build/buildd/kde4libs-4.3.2/kinit/kinit.cpp:1362
#56 0x0804fbca in main (argc=2, argv=0xbfc67054, envp=0xbfc67060) at /build/buildd/kde4libs-4.3.2/kinit/kinit.cpp:1793

Reported using DrKonqi