Version:           1.9.6 (using KDE 3.5.6 "release 25.2" , openSUSE )
Compiler:          Target: i586-suse-linux
OS:                Linux (i686) release 2.6.18.2-34-default

Clicked on the from field of a message and slected "add to address book" in the RMB menu. Here is the BT:
#9  0xb665fdfa in KABC::AddressBook::loadingHasFinished ()
   from /opt/kde3/lib/libkabc.so.1
#10 0xb553339e in KMMailtoAddAddrBookCommand::execute ()
   from /opt/kde3/lib/libkmailprivate.so
#11 0xb5523d39 in KMCommand::slotPostTransfer ()
   from /opt/kde3/lib/libkmailprivate.so
#12 0xb552be56 in KMCommand::qt_invoke () from /opt/kde3/lib/libkmailprivate.so
#13 0xb552c98b in KMMailtoAddAddrBookCommand::qt_invoke ()
   from /opt/kde3/lib/libkmailprivate.so
#14 0xb6c923cd in QObject::activate_signal ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#15 0xb5523dce in KMCommand::messagesTransfered ()
   from /opt/kde3/lib/libkmailprivate.so
#16 0xb552ce11 in KMCommand::transferSelectedMsgs ()
   from /opt/kde3/lib/libkmailprivate.so
#17 0xb552cf77 in KMCommand::slotStart () from /opt/kde3/lib/libkmailprivate.so
#18 0xb552be68 in KMCommand::qt_invoke () from /opt/kde3/lib/libkmailprivate.so
#19 0xb552c98b in KMMailtoAddAddrBookCommand::qt_invoke ()
   from /opt/kde3/lib/libkmailprivate.so
#20 0xb6c923cd in QObject::activate_signal ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#21 0xb6fcc11e in QSignal::signal () from /usr/lib/qt3/lib/libqt-mt.so.3
#22 0xb6cae497 in QSignal::activate () from /usr/lib/qt3/lib/libqt-mt.so.3
#23 0xb6cb5823 in QSingleShotTimer::event ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#24 0xb6c33647 in QApplication::internalNotify ()