Application that crashed: kontact
Version of the application: 4.3.1
KDE Version: 4.3.1 (KDE 4.3.1)
Qt Version: 4.5.2
Operating System: Linux 2.6.30-1-amd64 x86_64
Distribution: Debian GNU/Linux 4.3 (n/a)

What I was doing when the application crashed:
Actually, not just kontact but occasionally amarok and krdc


 -- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
[KCrash Handler]
#5  QList<KCal::Incidence*>::contains (this=0x2588e10, incidence=0x1542470) at /usr/include/qt4/QtCore/qlist.h:667
#6  KCal::ListBase<KCal::Incidence>::removeRef (this=0x2588e10, incidence=0x1542470) at ../../kcal/listbase.h:118
#7  KCal::Incidence::removeRelation (this=0x2588e10, incidence=0x1542470) at ../../kcal/incidence.cpp:534
#8  0x00007fac08dafa07 in ~Incidence (this=0x1542470, __in_chrg=<value optimized out>) at ../../kcal/incidence.cpp:206
#9  0x00007fac08db2315 in ~Todo (this=0x1542470, __in_chrg=<value optimized out>) at ../../kcal/todo.cpp:103
#10 0x00007fac08dd76fe in qDeleteAll<QList<KCal::Incidence*>::const_iterator> (this=0x13a5910) at /usr/include/qt4/QtCore/qalgorithms.h:350
#11 qDeleteAll<KCal::ListBase<KCal::Incidence> > (this=0x13a5910) at /usr/include/qt4/QtCore/qalgorithms.h:358
#12 KCal::ListBase<KCal::Incidence>::clearAll (this=0x13a5910) at ../../kcal/listbase.h:105
#13 KCal::CalendarLocal::close (this=0x13a5910) at ../../kcal/calendarlocal.cpp:171
#14 0x00007fac09327ecd in KRES::Resource::close (this=0x13a88e0) at ../../kresources/resource.cpp:141
#15 0x00007fac08e2f3c9 in KCal::CalendarResources::close (this=0x12719d0) at ../../kcal/calendarresources.cpp:350
#16 0x00007fac08e2f73d in ~CalendarResources (this=0x2588e10, __in_chrg=<value optimized out>) at ../../kcal/calendarresources.cpp:247
#17 0x00007fabf7e94e06 in KOrg::StdCalendar::~StdCalendar() () from /usr/lib/libkorganizer_calendar.so.4
#18 0x00007fabf7e964e7 in ?? () from /usr/lib/libkorganizer_calendar.so.4
#19 0x00007fac09c0347c in K3StaticDeleterPrivate::deleteStaticDeleters () at ../../kde3support/kdecore/k3staticdeleter.cpp:56
#20 0x00007fac0c99ea95 in qt_call_post_routines () at kernel/qcoreapplication.cpp:163
#21 0x00007fac0be20ad8 in ~QApplication (this=0x7fffa0945370, __in_chrg=<value optimized out>) at kernel/qapplication.cpp:971
#22 0x00000000004047e4 in _start ()

Reported using DrKonqi