here another output:

Anwendung: Kopete (kopete), Signal SIGSEGV
[?1034h[Thread debugging using libthread_db enabled]
[New Thread 0x7f2296539700 (LWP 10132)]
[KCrash handler]
#5  KNetworkConnector::errorCode (this=0x0)
    at /usr/src/debug/kdenetwork-4.1.0/kopete/protocols/yahoo/libkyahoo/yahooconnector.cpp:83
#6  0x00007f228292a4d9 in Client::streamError (this=0x8a9f60, error=10)
    at /usr/src/debug/kdenetwork-4.1.0/kopete/protocols/yahoo/libkyahoo/client.cpp:226
#7  0x00007f228292a5d8 in Client::qt_metacall (this=0x8a9f60, 
    _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, 
    _a=0x7fff9e57e3a0)
    at /usr/src/debug/kdenetwork-4.1.0/build/kopete/protocols/yahoo/libkyahoo/client.moc:235
#8  0x00007f2292648e50 in QMetaObject::activate (sender=0x9aa380, 
    from_signal_index=<value optimized out>, to_signal_index=7, 
    argv=0x7fff9e57e3a0) at kernel/qobject.cpp:3013
#9  0x00007f2282930791 in Stream::error (this=0x0, _t1=10)
    at /usr/src/debug/kdenetwork-4.1.0/build/kopete/protocols/yahoo/libkyahoo/stream.moc:102
#10 0x00007f228292f0e8 in ClientStream::qt_metacall (this=0x9aa380, 
    _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, 
    _a=0x7fff9e57e470)
    at /usr/src/debug/kdenetwork-4.1.0/build/kopete/protocols/yahoo/libkyahoo/yahooclientstream.moc:98
#11 0x00007f2292648e50 in QMetaObject::activate (sender=0x85ced0, 
    from_signal_index=<value optimized out>, to_signal_index=5, 
    argv=0x7fff9e57e3a0) at kernel/qobject.cpp:3013
#12 0x00007f228292fd00 in KNetworkConnector::qt_metacall (this=0x85ced0, 
    _c=QMetaObject::InvokeMetaMethod, _id=1, _a=0x7fff9e57e5d0)
    at /usr/src/debug/kdenetwork-4.1.0/build/kopete/protocols/yahoo/libkyahoo/yahooconnector.moc:68
#13 0x00007f2292648e50 in QMetaObject::activate (sender=0x9be510, 
    from_signal_index=<value optimized out>, to_signal_index=8, 
    argv=0x7fff9e57e3a0) at kernel/qobject.cpp:3013
#14 0x00007f228292e0e1 in ByteStream::error (this=0x0, _t1=17)
    at /usr/src/debug/kdenetwork-4.1.0/build/kopete/protocols/yahoo/libkyahoo/bytestream.moc:111
#15 0x00007f228292dc06 in KNetworkByteStream::qt_metacall (this=0x9be510, 
    _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, 
    _a=0x7fff9e57e700)
    at /usr/src/debug/kdenetwork-4.1.0/kopete/protocols/yahoo/libkyahoo/yahoobytestream.cpp:136
#16 0x00007f2292648e50 in QMetaObject::activate (sender=0x9eb5a0, 
    from_signal_index=<value optimized out>, to_signal_index=9, 
    argv=0x7fff9e57e3a0) at kernel/qobject.cpp:3013
#17 0x00007f22935ccb81 in KNetwork::KClientSocketBase::gotError (this=0x0, 
    _t1=17)
    at /usr/src/debug/kdelibs-4.1.0/build/kdecore/k3clientsocketbase.moc:111
#18 0x00007f22935cbe15 in KNetwork::KBufferedSocket::slotReadActivity (
    this=0x9eb5a0)
    at /usr/src/debug/kdelibs-4.1.0/kdecore/network/k3bufferedsocket.cpp:320
#19 0x00007f22935cb93d in KNetwork::KBufferedSocket::qt_metacall (
    this=0x9eb5a0, _c=QMetaObject::InvokeMetaMethod, _id=0, 
    _a=<value optimized out>)
    at /usr/src/debug/kdelibs-4.1.0/build/kdecore/k3bufferedsocket.moc:67
#20 0x00007f2292648e50 in QMetaObject::activate (sender=0x7f227c000920, 
    from_signal_index=<value optimized out>, to_signal_index=4, 
    argv=0x7fff9e57e3a0) at kernel/qobject.cpp:3013
#21 0x00007f2292679b4e in QSocketNotifier::activated (this=0x0, _t1=38)
    at .moc/release-shared/moc_qsocketnotifier.cpp:81
#22 0x00007f229264f2e3 in QSocketNotifier::event (this=0x7f227c000920, 
    e=0x7fff9e57ee00) at kernel/qsocketnotifier.cpp:326
#23 0x00007f228f288ebd in QApplicationPrivate::notify_helper (this=0x69aac0, 
    receiver=0x7f227c000920, e=0x7fff9e57ee00) at kernel/qapplication.cpp:3800
#24 0x00007f228f28f28a in QApplication::notify (this=0x7fff9e580350, 
    receiver=0x7f227c000920, e=0x7fff9e57ee00) at kernel/qapplication.cpp:3765
#25 0x00007f2294399ceb in KApplication::notify (this=0x7fff9e580350, 
    receiver=0x7f227c000920, event=0x7fff9e57ee00)
    at /usr/src/debug/kdelibs-4.1.0/kdeui/kernel/kapplication.cpp:311
#26 0x00007f229263778c in QCoreApplication::notifyInternal (
    this=0x7fff9e580350, receiver=0x7f227c000920, event=0x7fff9e57ee00)
    at kernel/qcoreapplication.cpp:587
#27 0x00007f229265cbc2 in QEventDispatcherUNIX::activateSocketNotifiers (
    this=<value optimized out>) at kernel/qcoreapplication.h:215
#28 0x00007f229265d338 in QEventDispatcherUNIXPrivate::doSelect (
    this=0x69d5a0, flags={i = -1638404192}, timeout=0x7fff9e57ef90)
    at kernel/qeventdispatcher_unix.cpp:252
#29 0x00007f229265e35d in QEventDispatcherUNIX::processEvents (this=0x69a620, 
    flags={i = -1638404000}) at kernel/qeventdispatcher_unix.cpp:909
#30 0x00007f228f309dca in QEventDispatcherX11::processEvents (this=0x69a620, 
    flags={i = -1638403136}) at kernel/qeventdispatcher_x11.cpp:154
#31 0x00007f22926360e2 in QEventLoop::processEvents (
    this=<value optimized out>, flags={i = -1638403088})
    at kernel/qeventloop.cpp:149
#32 0x00007f2292636275 in QEventLoop::exec (this=0x7fff9e57f440, flags=
      {i = -1638402976}) at kernel/qeventloop.cpp:196
#33 0x00007f228f6467ef in QDialog::exec (this=0x9e67f0)
    at dialogs/qdialog.cpp:453
#34 0x00007f2294313589 in KDialogQueue::Private::slotShowQueuedDialog (
    this=0x8a2690)
    at /usr/src/debug/kdelibs-4.1.0/kdeui/dialogs/kdialog.cpp:1051
#35 0x00007f229431363d in KDialogQueue::qt_metacall (this=0x8a25c0, 
    _c=QMetaObject::InvokeMetaMethod, _id=-1638407423, 
    _a=<value optimized out>)
    at /usr/src/debug/kdelibs-4.1.0/build/kdeui/kdialogqueue_p.moc:65
#36 0x00007f2292648e50 in QMetaObject::activate (sender=0x8a2700, 
    from_signal_index=<value optimized out>, to_signal_index=4, 
    argv=0x7fff9e57e3a0) at kernel/qobject.cpp:3013
#37 0x00007f229264f94f in QSingleShotTimer::timerEvent (this=0x8a2700)
    at kernel/qtimer.cpp:300
#38 0x00007f2292645013 in QObject::event (this=0x8a2700, e=0xa)
    at kernel/qobject.cpp:1105
#39 0x00007f228f288ebd in QApplicationPrivate::notify_helper (this=0x69aac0, 
    receiver=0x8a2700, e=0x7fff9e57fd00) at kernel/qapplication.cpp:3800
#40 0x00007f228f28f28a in QApplication::notify (this=0x7fff9e580350, 
    receiver=0x8a2700, e=0x7fff9e57fd00) at kernel/qapplication.cpp:3765
#41 0x00007f2294399ceb in KApplication::notify (this=0x7fff9e580350, 
    receiver=0x8a2700, event=0x7fff9e57fd00)
    at /usr/src/debug/kdelibs-4.1.0/kdeui/kernel/kapplication.cpp:311
#42 0x00007f229263778c in QCoreApplication::notifyInternal (
    this=0x7fff9e580350, receiver=0x8a2700, event=0x7fff9e57fd00)
    at kernel/qcoreapplication.cpp:587
#43 0x00007f229265dd80 in QTimerInfoList::activateTimers (this=0x69de00)
    at kernel/qcoreapplication.h:215
#44 0x00007f229265e3d8 in QEventDispatcherUNIX::processEvents (this=0x69a620, 
    flags={i = -1638400272}) at kernel/qeventdispatcher_unix.cpp:913
#45 0x00007f228f309dca in QEventDispatcherX11::processEvents (this=0x69a620, 
    flags={i = -1638399408}) at kernel/qeventdispatcher_x11.cpp:154
#46 0x00007f22926360e2 in QEventLoop::processEvents (
    this=<value optimized out>, flags={i = -1638399360})
    at kernel/qeventloop.cpp:149
#47 0x00007f2292636275 in QEventLoop::exec (this=0x7fff9e5802c0, flags=
      {i = -1638399280}) at kernel/qeventloop.cpp:196
#48 0x00007f2292638315 in QCoreApplication::exec ()
    at kernel/qcoreapplication.cpp:849
#49 0x00000000004471dc in main (argc=3, argv=0x7fff9e581108)
    at /usr/src/debug/kdenetwork-4.1.0/kopete/kopete/main.cpp:102
#0  0x00007f228d38a261 in nanosleep () from /lib64/libc.so.6

Nobody else has this bug? :(

can you please compile kopete with debug enabled and paste the console output when it crashes?

do I need a self compiled kopete? At the moment I have debuginfo packages installed.

here is the console output:
kopete(20451)/kopete (statistics): error " " on query: "SELECT name FROM sqlite_master WHERE type='table'"
kopete(20451)/kopete (statistics): error " " on query: "CREATE TABLE contactstatus (id INTEGER PRIMARY KEY,metacontactid TEXT,status TEXT,datetimebegin INTEGER,datetimeend INTEGER);"
kopete(20451)/kopete (statistics): error " " on query: "CREATE TABLE commonstats (id INTEGER PRIMARY KEY,metacontactidTEXT,statname TEXT,statvalue1 TEXT,statvalue2 TEXT);"
kopete(20451)/kopete (statistics): error " " on query: "CREATE TABLE statsgroup(id INTEGER PRIMARY KEY,datetimebegin INTEGER,datetimeend INTEGER,caption TEXT);"
kopete(20451)/libkopete Kopete::PluginManager::loadPluginInternal: Unable to find a plugin named ' "" '!
Transfer ACCEPTED by: LoginTask
Transfer ACCEPTED by: LoginTask
QObject: Do not delete object, 'unnamed', during its event handler!
QObject: Do not delete object, 'unnamed', during its event handler!
KCrash: Application 'kopete' crashing...
sock_file=/home/sts/.kde4/socket-linux-wqgx/kdeinit4__0

with kde 4.1.2 kopete doesn't crash anymore. But now, he means my login/password is wrong.

my mistake.. I use the name@yahoo.com for login instead of only name.

This bug exists in my latest installed version. 

I have kde4-kopete-4.1.3-35.12 from opensuse 11 factory. Backtrace is as below:

Application: Kopete (kopete), signal SIGSEGV
[?1034h[Thread debugging using libthread_db enabled]
[New Thread 0xb58d26d0 (LWP 3669)]
[KCrash handler]
#6  0xb35d6e22 in ClientStream::cp_outgoingData (this=0x83e8b80, 
    outgoingBytes=@0xbfdd8e68)
    at /usr/src/debug/kdenetwork-4.1.3/kopete/protocols/yahoo/libkyahoo/yahooclientstream.cpp:303
#7  0xb35d784d in ClientStream::qt_metacall (this=0x83e8b80, 
    _c=QMetaObject::InvokeMetaMethod, _id=8, _a=0xbfdd8e3c)
    at /usr/src/debug/kdenetwork-4.1.3/build/kopete/protocols/yahoo/libkyahoo/yahooclientstream.moc:99
#8  0xb736b730 in QMetaObject::activate (sender=0x847a000, 
    from_signal_index=4, to_signal_index=4, argv=0xbfdd8e3c)
    at kernel/qobject.cpp:3031
#9  0xb736c4b2 in QMetaObject::activate (sender=0x847a000, m=0xb361013c, 
    local_signal_index=0, argv=0xbfdd8e3c) at kernel/qobject.cpp:3101
#10 0xb35dbfb3 in CoreProtocol::outgoingData (this=0x847a000, _t1=@0xbfdd8e68)
    at /usr/src/debug/kdenetwork-4.1.3/build/kopete/protocols/yahoo/libkyahoo/coreprotocol.moc:83
#11 0xb35dc471 in CoreProtocol::outgoingTransfer (this=0x847a000, 
    outgoing=0x83f1cd8)
    at /usr/src/debug/kdenetwork-4.1.3/kopete/protocols/yahoo/libkyahoo/coreprotocol.cpp:141
#12 0xb35d73ea in ClientStream::write (this=0x83e8b80, request=0x83f1cd8)
    at /usr/src/debug/kdenetwork-4.1.3/kopete/protocols/yahoo/libkyahoo/yahooclientstream.cpp:253
#13 0xb35cdc61 in Client::send (this=0x818fc60, request=0x83f1cd8)
    at /usr/src/debug/kdenetwork-4.1.3/kopete/protocols/yahoo/libkyahoo/client.cpp:772
#14 0xb35d2b3a in Task::send (this=0x83a6b10, request=0x83f1cd8)
    at /usr/src/debug/kdenetwork-4.1.3/kopete/protocols/yahoo/libkyahoo/task.cpp:178
#15 0xb35dcb57 in LoginTask::sendVerify (this=0x83a6b10)
    at /usr/src/debug/kdenetwork-4.1.3/kopete/protocols/yahoo/libkyahoo/logintask.cpp:147
#16 0xb35dd0c0 in LoginTask::onGo (this=0x83a6b10)
    at /usr/src/debug/kdenetwork-4.1.3/kopete/protocols/yahoo/libkyahoo/logintask.cpp:132
#17 0xb35d29ca in Task::go (this=0x83a6b10, autoDelete=false)
    at /usr/src/debug/kdenetwork-4.1.3/kopete/protocols/yahoo/libkyahoo/task.cpp:122
#18 0xb35d0b59 in Client::cs_connected (this=0x818fc60)
    at /usr/src/debug/kdenetwork-4.1.3/kopete/protocols/yahoo/libkyahoo/client.cpp:174
#19 0xb35d1e95 in Client::qt_metacall (this=0x818fc60, 
    _c=QMetaObject::InvokeMetaMethod, _id=54, _a=0xbfdd9008)
    at /usr/src/debug/kdenetwork-4.1.3/build/kopete/protocols/yahoo/libkyahoo/client.moc:232
#20 0xb736b730 in QMetaObject::activate (sender=0x86b4c50, 
    from_signal_index=8, to_signal_index=8, argv=0x0)
    at kernel/qobject.cpp:3031
#21 0xb736c4b2 in QMetaObject::activate (sender=0x86b4c50, m=0xb360ff80, 
    local_signal_index=0, argv=0x0) at kernel/qobject.cpp:3101
#22 0xb35d7047 in ClientStream::connected (this=0x86b4c50)
    at /usr/src/debug/kdenetwork-4.1.3/build/kopete/protocols/yahoo/libkyahoo/yahooclientstream.moc:117
#23 0xb35d730a in ClientStream::cr_connected (this=0x86b4c50)
    at /usr/src/debug/kdenetwork-4.1.3/kopete/protocols/yahoo/libkyahoo/yahooclientstream.cpp:336
#24 0xb35d787b in ClientStream::qt_metacall (this=0x86b4c50, 
    _c=QMetaObject::InvokeMetaMethod, _id=6, _a=0xbfdd9138)
    at /usr/src/debug/kdenetwork-4.1.3/build/kopete/protocols/yahoo/libkyahoo/yahooclientstream.moc:97
#25 0xb736b730 in QMetaObject::activate (sender=0x8682778, 
    from_signal_index=4, to_signal_index=4, argv=0x0)
    at kernel/qobject.cpp:3031
#26 0xb736c4b2 in QMetaObject::activate (sender=0x8682778, m=0xb360fd14, 
    local_signal_index=0, argv=0x0) at kernel/qobject.cpp:3101
#27 0xb35d3637 in Connector::connected (this=0x8682778)
    at /usr/src/debug/kdenetwork-4.1.3/build/kopete/protocols/yahoo/libkyahoo/connector.moc:77
#28 0xb35d860d in KNetworkConnector::slotConnected (this=0x8682778)
    at /usr/src/debug/kdenetwork-4.1.3/kopete/protocols/yahoo/libkyahoo/yahooconnector.cpp:72
#29 0xb35d86ab in KNetworkConnector::qt_metacall (this=0x8682778, 
    _c=QMetaObject::InvokeMetaMethod, _id=0, _a=0xbfdd9238)
    at /usr/src/debug/kdenetwork-4.1.3/build/kopete/protocols/yahoo/libkyahoo/yahooconnector.moc:67
#30 0xb736b730 in QMetaObject::activate (sender=0x82f35d0, 
    from_signal_index=9, to_signal_index=9, argv=0x0)
    at kernel/qobject.cpp:3031
#31 0xb736c4b2 in QMetaObject::activate (sender=0x82f35d0, m=0xb360fe84, 
    local_signal_index=0, argv=0x0) at kernel/qobject.cpp:3101
#32 0xb35d5b37 in KNetworkByteStream::connected (this=0x82f35d0)
    at /usr/src/debug/kdenetwork-4.1.3/build/kopete/protocols/yahoo/libkyahoo/yahoobytestream.moc:90
#33 0xb35d5dbe in KNetworkByteStream::qt_metacall (this=0x82f35d0, 
    _c=QMetaObject::InvokeMetaMethod, _id=-5, _a=0xbfdd937c)
    at /usr/src/debug/kdenetwork-4.1.3/kopete/protocols/yahoo/libkyahoo/yahoobytestream.cpp:91
#34 0xb736b730 in QMetaObject::activate (sender=0x817fd40, 
    from_signal_index=13, to_signal_index=13, argv=0xbfdd937c)
    at kernel/qobject.cpp:3031
#35 0xb736c4b2 in QMetaObject::activate (sender=0x817fd40, m=0xb76fb7a4, 
    local_signal_index=5, argv=0xbfdd937c) at kernel/qobject.cpp:3101
#36 0xb7647a53 in KNetwork::KClientSocketBase::connected (this=0x817fd40, 
    _t1=@0x8422130)
    at /usr/src/debug/kdelibs-4.1.3/build/kdecore/k3clientsocketbase.moc:138
#37 0xb7658f55 in KNetwork::KStreamSocket::connectionSucceeded (
    this=0x817fd40, peer=@0x8422130)
    at /usr/src/debug/kdelibs-4.1.3/kdecore/network/k3streamsocket.cpp:381
#38 0xb76592b9 in KNetwork::KStreamSocket::connectionEvent (this=0x817fd40)
    at /usr/src/debug/kdelibs-4.1.3/kdecore/network/k3streamsocket.cpp:298
#39 0xb7659693 in KNetwork::KStreamSocket::qt_metacall (this=0x817fd40, 
    _c=QMetaObject::InvokeMetaMethod, _id=2, _a=0xbfdd953c)
    at /usr/src/debug/kdelibs-4.1.3/build/kdecore/k3streamsocket.moc:74
#40 0xb76464fa in KNetwork::KBufferedSocket::qt_metacall (this=0x817fd40, 
    _c=QMetaObject::InvokeMetaMethod, _id=21, _a=0xbfdd953c)
    at /usr/src/debug/kdelibs-4.1.3/build/kdecore/k3bufferedsocket.moc:62
#41 0xb736b730 in QMetaObject::activate (sender=0x846a0e0, 
    from_signal_index=4, to_signal_index=4, argv=0xbfdd953c)
    at kernel/qobject.cpp:3031
#42 0xb736c4b2 in QMetaObject::activate (sender=0x846a0e0, m=0xb743a8b0, 
    local_signal_index=0, argv=0xbfdd953c) at kernel/qobject.cpp:3101
#43 0xb73a6a43 in QSocketNotifier::activated (this=0x846a0e0, _t1=10)
    at .moc/release-shared/moc_qsocketnotifier.cpp:81
#44 0xb73713f7 in QSocketNotifier::event (this=0x846a0e0, e=0xbfdd9900)
    at kernel/qsocketnotifier.cpp:320
#45 0xb651482c in QApplicationPrivate::notify_helper (this=0x80be188, 
    receiver=0x846a0e0, e=0xbfdd9900) at kernel/qapplication.cpp:3803
#46 0xb651c6ce in QApplication::notify (this=0xbfdd9b6c, receiver=0x846a0e0, 
    e=0xbfdd9900) at kernel/qapplication.cpp:3393
#47 0xb79ad2ed in KApplication::notify (this=0xbfdd9b6c, receiver=0x846a0e0, 
    event=0xbfdd9900)
    at /usr/src/debug/kdelibs-4.1.3/kdeui/kernel/kapplication.cpp:311
#48 0xb7356a61 in QCoreApplication::notifyInternal (this=0xbfdd9b6c, 
    receiver=0x846a0e0, event=0xbfdd9900) at kernel/qcoreapplication.cpp:587
#49 0xb738148a in socketNotifierSourceDispatch (source=0x80cd718)
    at kernel/qcoreapplication.h:209
#50 0xb5ca20b8 in IA__g_main_context_dispatch (context=0x80cd658)
    at gmain.c:2144
#51 0xb5ca5753 in g_main_context_iterate (context=0x80cd658, block=1, 
    dispatch=1, self=0x80cba50) at gmain.c:2778
#52 0xb5ca5911 in IA__g_main_context_iteration (context=0x80cd658, may_block=1)
    at gmain.c:2841
#53 0xb73811f8 in QEventDispatcherGlib::processEvents (this=0x80be2b8, flags=
      {i = -1075996072}) at kernel/qeventdispatcher_glib.cpp:319
#54 0xb65ad885 in QGuiEventDispatcherGlib::processEvents (this=0x80be2b8, 
    flags={i = -1075996024}) at kernel/qguieventdispatcher_glib.cpp:198
#55 0xb735513a in QEventLoop::processEvents (this=0xbfdd9b00, flags=
      {i = -1075995960}) at kernel/qeventloop.cpp:143
#56 0xb73552fa in QEventLoop::exec (this=0xbfdd9b00, flags={i = -1075995896})
    at kernel/qeventloop.cpp:194
#57 0xb7357995 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:845
#58 0xb65146a7 in QApplication::exec () at kernel/qapplication.cpp:3331
#59 0x08088c3f in main (argc=3, argv=0xbfdd9f54)
    at /usr/src/debug/kdenetwork-4.1.3/kopete/kopete/main.cpp:102
#0  0xffffe430 in __kernel_vsyscall ()