Application that crashed: kmail
Version of the application: 1.12.4
KDE Version: 4.3.4 (KDE 4.3.4)
Qt Version: 4.5.3
Operating System: Linux 2.6.30-2-686 i686
Distribution: Debian GNU/Linux testing (squeeze)

What I was doing when the application crashed:
This is, so far, an isolated incident. I was drafting an e-mail in Kontact, closed Kontact, then when I discarded the e-mail Kontact crashed

 -- Backtrace:
Application: KMail (kmail), signal: Segmentation fault
[KCrash Handler]
#6  KMFilterMgr::deref (this=0x0, force=false) at ../../kmail/kmfiltermgr.cpp:365
#7  0xb7413e54 in KMail::AccountManager::processNextCheck (this=0x95fcb58, _newMail=false) at ../../kmail/accountmanager.cpp:175
#8  0xb74153d8 in KMail::AccountManager::qt_metacall (this=0x95fcb58, _c=QMetaObject::InvokeMetaMethod, _id=12, _a=0xbfcad614) at ./accountmanager.moc:96
#9  0xb704c303 in QMetaObject::activate (sender=0x967dc78, from_signal_index=4, to_signal_index=4, argv=0xbfcad614) at kernel/qobject.cpp:3112
#10 0xb704cf42 in QMetaObject::activate (sender=0x967dc78, m=0xb79d3fa4, local_signal_index=0, argv=0xbfcad614) at kernel/qobject.cpp:3186
#11 0xb73800df in KMAccount::finishedCheck (this=0x967dc78, _t1=false, _t2=KMAccount::CheckOK) at ./kmaccount.moc:162
#12 0xb7380aae in KMAccount::checkDone (this=0x967dc78, newmail=false, status=KMAccount::CheckOK) at ../../kmail/kmaccount.cpp:507
#13 0xb749155b in KMAcctImap::killAllJobs (this=0x967dc78, disconnectSlave=true) at ../../kmail/kmacctimap.cpp:204
#14 0xb749167f in ~KMAcctImap (this=0x967dc78, __in_chrg=<value optimized out>) at ../../kmail/kmacctimap.cpp:86
#15 0xb7412f2e in qDeleteAll<QList<KMAccount*>::const_iterator> (this=0x95fcb58, __in_chrg=<value optimized out>) at /usr/include/qt4/QtCore/qalgorithms.h:350
#16 qDeleteAll<AccountList> (this=0x95fcb58, __in_chrg=<value optimized out>) at /usr/include/qt4/QtCore/qalgorithms.h:358
#17 ~AccountManager (this=0x95fcb58, __in_chrg=<value optimized out>) at ../../kmail/accountmanager.cpp:39
#18 0xb74fe751 in KMKernel::cleanup (this=0xbfcad880) at ../../kmail/kmkernel.cpp:1731
#19 0x0804a6ec in main (argc=2, argv=0xbfcadac4) at ../../kmail/main.cpp:148

Reported using DrKonqi