Version:           1.12.4 (using KDE 4.3.5)
OS:                Linux
Installed from:    Ubuntu Packages

I clicked on the Inbox folder of my Gmail account. The check for new mail stopped at 84% and I closed kmail and then it crashed. 

Application: KMail (kmail), signal: Segmentation fault
[KCrash Handler]
#6  KMFilterMgr::deref (this=0x0, force=false) at ../../kmail/kmfiltermgr.cpp:365
#7  0x00a5a2e4 in KMail::AccountManager::processNextCheck (this=0x9c757b0, _newMail=false) at ../../kmail/accountmanager.cpp:175
#8  0x00a5b868 in KMail::AccountManager::qt_metacall (this=0x9c757b0, _c=QMetaObject::InvokeMetaMethod, _id=12, _a=0xbfab2314) at ./accountmanager.moc:96
#9  0x03795263 in QMetaObject::activate (sender=0x9d34358, from_signal_index=4, to_signal_index=4, argv=0xbfab2314) at kernel/qobject.cpp:3113
#10 0x03795ec2 in QMetaObject::activate (sender=0x9d34358, m=0x101ff84, local_signal_index=0, argv=0xbfab2314) at kernel/qobject.cpp:3187
#11 0x009c56ef in KMAccount::finishedCheck (this=0x9d34358, _t1=false, _t2=KMAccount::CheckOK) at ./kmaccount.moc:162
#12 0x009c60be in KMAccount::checkDone (this=0x9d34358, newmail=false, status=KMAccount::CheckOK) at ../../kmail/kmaccount.cpp:507
#13 0x00ad781b in KMAcctImap::killAllJobs (this=0x9d34358, disconnectSlave=false) at ../../kmail/kmacctimap.cpp:204
#14 0x00aef48a in ~KMFolderImap (this=0x9c86b80, __in_chrg=<value optimized out>) at ../../kmail/kmfolderimap.cpp:95
#15 0x00a105df in ~KMFolder (this=0x9d0cda8, __in_chrg=<value optimized out>) at ../../kmail/kmfolder.cpp:169
#16 0x00a68626 in qDeleteAll<QList<KMFolderNode*>::iterator> (begin=) at /usr/include/qt4/QtCore/qalgorithms.h:350
#17 0x00a65838 in ~KMFolderDir (this=0x9cf15f8, __in_chrg=<value optimized out>) at ../../kmail/kmfolderdir.cpp:91
#18 0x00a68626 in qDeleteAll<QList<KMFolderNode*>::iterator> (begin=) at /usr/include/qt4/QtCore/qalgorithms.h:350
#19 0x00a66512 in ~KMFolderRootDir (this=0x9ce9e14, __in_chrg=<value optimized out>) at ../../kmail/kmfolderdir.cpp:37
#20 0x00a6a386 in ~KMFolderMgr (this=0x9ce9e08, __in_chrg=<value optimized out>) at ../../kmail/kmfoldermgr.cpp:54
#21 0x00b4573f in KMKernel::cleanup (this=0xbfab265c) at ../../kmail/kmkernel.cpp:1754
#22 0x0804a70c in main (argc=3, argv=0xbfab28d4) at ../../kmail/main.cpp:148