More accurately this crash occurs with Kopete 0.50.80, which is included in kdenetwork 4.0.83.

Backtrace:
Application: Kopete (kopete), signal SIGSEGV
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
[Thread debugging using libthread_db enabled]
[New Thread 0xb5998b40 (LWP 17350)]
[New Thread 0xb364cb90 (LWP 17377)]
[KCrash handler]
#6  0xb718cbd7 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#7  0xb7ea4a2f in Kopete::ChatSession::remoteTyping ()
   from /usr/lib/kde4/lib/libkopete.so.4
#8  0xb7ea4a6c in Kopete::ChatSession::receivedTypingMsg ()
   from /usr/lib/kde4/lib/libkopete.so.4
#9  0xb383e3c4 in OscarAccount::messageReceived ()
   from /usr/lib/kde4/lib/libkopete_oscar.so.4.1.0
#10 0xb3886905 in ?? () from /usr/lib/kde4/lib/kde4/kopete_aim.so
#11 0xb3840e89 in OscarAccount::qt_metacall ()
   from /usr/lib/kde4/lib/libkopete_oscar.so.4.1.0
#12 0xb388945a in ?? () from /usr/lib/kde4/lib/kde4/kopete_aim.so
#13 0xb718c4f9 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#14 0xb718cbc2 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#15 0xb3746913 in Client::messageReceived ()
   from /usr/lib/kde4/lib/liboscar.so.1
#16 0xb374ae01 in Client::receivedMessage ()
   from /usr/lib/kde4/lib/liboscar.so.1
#17 0xb374e197 in Client::qt_metacall () from /usr/lib/kde4/lib/liboscar.so.1
#18 0xb718c4f9 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#19 0xb718cbc2 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#20 0xb37c8d03 in ?? () from /usr/lib/kde4/lib/liboscar.so.1
#21 0xb37caf0f in ?? () from /usr/lib/kde4/lib/liboscar.so.1
#22 0xb37cb405 in ?? () from /usr/lib/kde4/lib/liboscar.so.1
#23 0xb379ae3d in ?? () from /usr/lib/kde4/lib/liboscar.so.1
#24 0xb3776564 in Connection::distribute ()
   from /usr/lib/kde4/lib/liboscar.so.1
#25 0xb3776624 in Connection::streamReadyRead ()
   from /usr/lib/kde4/lib/liboscar.so.1
#26 0xb3776711 in Connection::qt_metacall ()
   from /usr/lib/kde4/lib/liboscar.so.1
#27 0xb718c4f9 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#28 0xb718cbc2 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#29 0xb3762d07 in ?? () from /usr/lib/kde4/lib/liboscar.so.1
#30 0xb37609ed in ClientStream::doReadyRead ()
   from /usr/lib/kde4/lib/liboscar.so.1
#31 0xb3760d76 in ClientStream::cp_incomingData ()
   from /usr/lib/kde4/lib/liboscar.so.1
#32 0xb3760ee1 in ClientStream::qt_metacall ()
   from /usr/lib/kde4/lib/liboscar.so.1
#33 0xb718c4f9 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#34 0xb718cbc2 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#35 0xb3752f07 in ?? () from /usr/lib/kde4/lib/liboscar.so.1
#36 0xb3753ac9 in ?? () from /usr/lib/kde4/lib/liboscar.so.1
#37 0xb3753de5 in ?? () from /usr/lib/kde4/lib/liboscar.so.1
#38 0xb3760a47 in ClientStream::socketReadyRead ()
   from /usr/lib/kde4/lib/liboscar.so.1
#39 0xb3760f26 in ClientStream::qt_metacall ()
   from /usr/lib/kde4/lib/liboscar.so.1
#40 0xb718c4f9 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#41 0xb718cbc2 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#42 0xb71c7f87 in QIODevice::readyRead () from /usr/lib/libQtCore.so.4
#43 0xb618be27 in ?? () from /usr/lib/libQtNetwork.so.4
#44 0xb617b66b in ?? () from /usr/lib/libQtNetwork.so.4
#45 0xb617c72f in ?? () from /usr/lib/libQtNetwork.so.4
#46 0xb67a9c0c in QApplicationPrivate::notify_helper ()
   from /usr/lib/libQtGui.so.4
#47 0xb67ae7a9 in QApplication::notify () from /usr/lib/libQtGui.so.4
#48 0xb7655d93 in KApplication::notify (this=0xbfc81178, receiver=0x858f6c0, 
    event=0xbfc80f20)
    at /build/buildd/kde4libs-4.0.83/kdeui/kernel/kapplication.cpp:311
#49 0xb71776a9 in QCoreApplication::notifyInternal ()
   from /usr/lib/libQtCore.so.4
#50 0xb71a2e23 in ?? () from /usr/lib/libQtCore.so.4
#51 0xb5ef8bf8 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#52 0xb5efbe5e in ?? () from /usr/lib/libglib-2.0.so.0
#53 0xb5efc3ac in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#54 0xb71a2f98 in QEventDispatcherGlib::processEvents ()
   from /usr/lib/libQtCore.so.4
#55 0xb683d1b5 in ?? () from /usr/lib/libQtGui.so.4
#56 0xb717692d in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#57 0xb7176abd in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#58 0xb7178d3d in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#59 0xb67a9567 in QApplication::exec () from /usr/lib/libQtGui.so.4
#60 0x08087f6b in ?? ()
#61 0xb63cb450 in __libc_start_main () from /lib/tls/i686/cmov/libc.so.6
#62 0x080644e1 in _start ()
#0  0xb7f41410 in __kernel_vsyscall ()


Attaching upstream report.