Version:           unknown (using KDE 3.5.6, Kubuntu (feisty) 4:3.5.6-0ubuntu14)
Compiler:          Target: i486-linux-gnu
OS:                Linux (i686) release 2.6.20-16-generic

This is my backtrace when I close akregator or kontact :
An idea to correct this ?

Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1".
[Thread debugging using libthread_db enabled]
[New Thread -1243355440 (LWP 21146)]
[New Thread -1287152752 (LWP 21150)]
[New Thread -1278760048 (LWP 21149)]
[New Thread -1270367344 (LWP 21148)]
[New Thread -1261974640 (LWP 21147)]
[KCrash handler]
#6  c4_Column::CopyData (this=0x95acfa4, to_=1994568014, from_=0, 
    count_=-1994568014)
    at /build/buildd/kdepim-3.5.6/./akregator/src/mk4storage/metakit/src/column.cpp:297
#7  0xb2071037 in c4_Column::FinishSlack (this=0x95acfa4)
    at /build/buildd/kdepim-3.5.6/./akregator/src/mk4storage/metakit/src/column.cpp:692
#8  0xb2073cca in ~c4_Column (this=0x95acfa4)
    at /build/buildd/kdepim-3.5.6/./akregator/src/mk4storage/metakit/src/column.cpp:91
#9  0xb2078b47 in ~c4_FormatB (this=0x95acf30)
    at /build/buildd/kdepim-3.5.6/./akregator/src/mk4storage/metakit/src/format.cpp:339
#10 0xb208b09d in ~c4_FormatS (this=0x95acf30)
    at /build/buildd/kdepim-3.5.6/./akregator/src/mk4storage/metakit/src/format.cpp:868
#11 0xb2079fbb in c4_HandlerSeq::DetachFromStorage (this=0x95ac790, 
    full_=true)
    at /build/buildd/kdepim-3.5.6/./akregator/src/mk4storage/metakit/src/handler.cpp:185
#12 0xb207b8f9 in ~c4_HandlerSeq (this=0x95ac790)
    at /build/buildd/kdepim-3.5.6/./akregator/src/mk4storage/metakit/src/handler.cpp:108
#13 0xb206e260 in c4_Sequence::DecRef (this=0x95acfa4)
    at /build/buildd/kdepim-3.5.6/./akregator/src/mk4storage/metakit/src/viewx.cpp:51
#14 0xb20751ef in ~c4_Storage (this=0x948bb40)
    at /build/buildd/kdepim-3.5.6/./akregator/src/mk4storage/metakit/src/../include/mk4.inl:151
#15 0xb206970a in ~FeedStorageMK4Impl (this=0x95ade40)
    at /build/buildd/kdepim-3.5.6/./akregator/src/mk4storage/feedstoragemk4impl.cpp:177
#16 0xb2065a26 in Akregator::Backend::StorageMK4Impl::close (this=0x882de88)
    at /build/buildd/kdepim-3.5.6/./akregator/src/mk4storage/storagemk4impl.cpp:155
#17 0xb2069a7a in ~StorageMK4Impl (this=0x882de88)
    at /build/buildd/kdepim-3.5.6/./akregator/src/mk4storage/storagemk4impl.cpp:103
#18 0xb21ce828 in Akregator::Part::slotOnShutdown (this=0x881fd40)
    at /build/buildd/kdepim-3.5.6/./akregator/src/akregator_part.cpp:268
#19 0xb21ce941 in Akregator::Part::qt_invoke (this=0x881fd40, _id=16, 
    _o=0xbfdfbcfc) at ./akregator_part.moc:222
#20 0xb6f3988b in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#21 0xb6f3a330 in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#22 0xb7521a7c in KApplication::shutDown () from /usr/lib/libkdecore.so.4
#23 0xb7535b3b in KApplication::qt_emit () from /usr/lib/libkdecore.so.4
#24 0xb7535b8b in KUniqueApplication::qt_emit () from /usr/lib/libkdecore.so.4
#25 0xb6f3998c in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#26 0xb6f3a330 in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#27 0xb72be143 in QApplication::aboutToQuit () from /usr/lib/libqt-mt.so.3
#28 0xb6eeb212 in QEventLoop::enterLoop () from /usr/lib/libqt-mt.so.3
#29 0xb6eeaf46 in QEventLoop::exec () from /usr/lib/libqt-mt.so.3
#30 0xb6ed2609 in QApplication::exec () from /usr/lib/libqt-mt.so.3
#31 0x08061e25 in main (argc=15, argv=)
    at /build/buildd/kdepim-3.5.6/./kontact/src/main.cpp:163
#32 0xb76a6ebc in __libc_start_main () from /lib/tls/i686/cmov/libc.so.6
#33 0x08059151 in _start ()