Version:           SVN (using KDE KDE 3.5.3)
Installed from:    Ubuntu Packages
Compiler:          gcc-4.0.3 
OS:                Linux

I had a chat session already opened (with MSN protocol)
I tried to start a new session with another MSN contact, double-clicking on his icon inside the desklist-plugin
While the new tab was opening, kopete crashed.
I don't know if the problem is related with the desklist plugin or with kopete itself...
This is the backtrace:

Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1".
[Thread debugging using libthread_db enabled]
[New Thread -1239853376 (LWP 8735)]
[New Thread -1273943120 (LWP 9053)]
[KCrash handler]
#6  0xb7303397 in KXMLGUI::ActionList::unplug () from /usr/lib/libkdeui.so.4
#7  0xb7383514 in KXMLGUI::ContainerNode::unplugClient ()
   from /usr/lib/libkdeui.so.4
#8  0xb738377f in KXMLGUI::ContainerNode::unplugActions ()
   from /usr/lib/libkdeui.so.4
#9  0xb73841bd in KXMLGUI::ContainerNode::destruct ()
   from /usr/lib/libkdeui.so.4
#10 0xb7384374 in KXMLGUI::ContainerNode::destructChildren ()
   from /usr/lib/libkdeui.so.4
#11 0xb73841ab in KXMLGUI::ContainerNode::destruct ()
   from /usr/lib/libkdeui.so.4
#12 0xb7384374 in KXMLGUI::ContainerNode::destructChildren ()
   from /usr/lib/libkdeui.so.4
#13 0xb73841ab in KXMLGUI::ContainerNode::destruct ()
   from /usr/lib/libkdeui.so.4
#14 0xb7384374 in KXMLGUI::ContainerNode::destructChildren ()
   from /usr/lib/libkdeui.so.4
#15 0xb73841ab in KXMLGUI::ContainerNode::destruct ()
   from /usr/lib/libkdeui.so.4
#16 0xb740624d in KXMLGUIFactory::removeClient () from /usr/lib/libkdeui.so.4
#17 0xb74065fa in KXMLGUIFactory::removeClient () from /usr/lib/libkdeui.so.4
#18 0xb5dd8066 in KopeteChatWindow::setActiveView (this=0x8794528, 
    widget=0x8cfe4e0)
    at /home/federico/programmi/kopetesvn/0.12/kopete/kopete/chatwindow/kopetechatwindow.cpp:843
#19 0xb5dcb3ca in ChatView::makeVisible (this=0x8cfe4e0)
    at /home/federico/programmi/kopetesvn/0.12/kopete/kopete/chatwindow/chatview.cpp:326
#20 0xb5dc9947 in ChatView::raise (this=0x8cfe4e0, activate=true)
    at /home/federico/programmi/kopetesvn/0.12/kopete/kopete/chatwindow/chatview.cpp:276
#21 0xb7ea0c69 in Kopete::Contact::startChat (this=0x84ce888)
    at /home/federico/programmi/kopetesvn/0.12/kopete/libkopete/kopetecontact.cpp:430
#22 0xb7ec5fd9 in Kopete::MetaContact::startChat (this=0x83ec698)
    at /home/federico/programmi/kopetesvn/0.12/kopete/libkopete/kopetemetacontact.cpp:368
#23 0xb529d0ce in KopeteDesklistItem::mouseDoubleClickEvent ()
   from /usr/lib/kde3/kopete_desklist.so
#24 0xb69dc6cc in QWidget::event () from /usr/lib/libqt-mt.so.3
#25 0xb6937e56 in QApplication::internalNotify () from /usr/lib/libqt-mt.so.3
#26 0xb69383e0 in QApplication::notify () from /usr/lib/libqt-mt.so.3
#27 0xb70bae31 in KApplication::notify () from /usr/lib/libkdecore.so.4
#28 0xb68c91c5 in QApplication::sendSpontaneousEvent ()
   from /usr/lib/libqt-mt.so.3
#29 0xb68c4873 in QETWidget::translateMouseEvent ()
   from /usr/lib/libqt-mt.so.3
#30 0xb68c2d59 in QApplication::x11ProcessEvent () from /usr/lib/libqt-mt.so.3
#31 0xb68dc4db in QEventLoop::processEvents () from /usr/lib/libqt-mt.so.3
#32 0xb6950947 in QEventLoop::enterLoop () from /usr/lib/libqt-mt.so.3
#33 0xb695086a in QEventLoop::exec () from /usr/lib/libqt-mt.so.3
#34 0xb6936965 in QApplication::exec () from /usr/lib/libqt-mt.so.3
#35 0x08073915 in main (argc=1, argv=0xbfca3db4)
    at /home/federico/programmi/kopetesvn/0.12/kopete/kopete/main.cpp:107