crash when changing changing metacontact's protocol to chat with

[Jakub 'Livio' Rusinek]

#0 0xffffe430 in __kernel_vsyscall ()
#1 0xb71d2900 in raise () from /lib/libc.so.6
#2 0xb71d4238 in abort () from /lib/libc.so.6
#3 0xb8045701 in sighandler (sig=11) at gtkmain.c:193
#4 <signal handler called>
#5 0x006b696e in ?? ()
#6 0xb7079500 in escape_message (
    text=0xb8851f00 "<div class=\"chatItem outgoingItem\">\n\t<table width=\"100%\">\n\t\t<tr>\n\t\t\t<td valign=\"top\">\n\t\t\t\t<img src=\"/home/livio/.icons/tangua/48x48/places/start-here.png\" class=\"avatar\" title=\"Livio\" />\n\t\t\t\t<div clas"..., gx=0xb880ad70) at webkit.c:752
#7 0xb707af70 in pidgin_webkit_write_conv (conv=0xb882bf90,
    name=0xb87f0d20 "JID-OF-MY-CONTACT", alias=0xb819c1c8 "Livio",
    message=0xb86f0078 "bum", flags=PURPLE_MESSAGE_SEND, mtime=1221938338)
    at webkit.c:926
#8 0xb7683861 in purple_conversation_write (conv=0xb882bf90,
    who=0xb87f0d20 "JID-OF-MY-CONTACT", message=0xb8848cb8 "MESSAGE-CONTENT",
    flags=<value optimized out>, mtime=1221938338) at conversation.c:952
#9 0xb8011b15 in pidgin_conv_write_im (conv=0xb86f2ad0, who=0x0,
    message=0xb8848cb8 "MESSAGE-CONTENT", flags=0, mtime=1221938338) at gtkconv.c:5344
#10 0xb7684b79 in purple_conv_im_write (im=0xb86d2b50, who=0x0,
    message=0xb8848cb8 "MESSAGE-CONTENT", flags=PURPLE_MESSAGE_SEND, mtime=1221938338)
    at conversation.c:1171
---Type <return> to continue, or q <return> to quit---
#11 0xb768514b in common_send (conv=0xb882bf90, message=<value optimized out>,
    msgflags=PURPLE_MESSAGE_SEND) at conversation.c:140
#12 0xb80177b2 in send_cb (widget=0xb83f94a8, gtkconv=0xb877e100)
    at gtkconv.c:584
#13 0xb75c32a4 in g_cclosure_marshal_VOID__VOID ()
   from /usr/lib/libgobject-2.0.so.0
#14 0xb75b5c3b in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0
#15 0xb75ca6f2 in signal_emit_unlocked_R () from /usr/lib/libgobject-2.0.so.0
#16 0xb7b65fd0 in gtk_binding_entry_activate ()
   from /usr/lib/libgtk-x11-2.0.so.0
#17 0xb7b6658c in binding_match_activate () from /usr/lib/libgtk-x11-2.0.so.0
#18 0xb7b667fd in gtk_bindings_activate_list ()
   from /usr/lib/libgtk-x11-2.0.so.0
#19 0xb7b6696e in gtk_bindings_activate_event ()
   from /usr/lib/libgtk-x11-2.0.so.0
#20 0xb7d1f1ad in gtk_text_view_key_press_event ()
   from /usr/lib/libgtk-x11-2.0.so.0
#21 0xb7c51156 in _gtk_marshal_BOOLEAN__BOXED ()
   from /usr/lib/libgtk-x11-2.0.so.0
#22 0xb75b4389 in g_type_class_meta_marshal ()
   from /usr/lib/libgobject-2.0.so.0
#23 0xb75b5b68 in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0
#24 0xb75c9e7f in signal_emit_unlocked_R () from /usr/lib/libgobject-2.0.so.0
---Type <return> to continue, or q <return> to quit---
#25 0xb75cb50c in g_signal_emit_valist () from /usr/lib/libgobject-2.0.so.0
#26 0xb75cbae6 in g_signal_emit () from /usr/lib/libgobject-2.0.so.0
#27 0xb7d79fde in gtk_widget_event_internal ()
   from /usr/lib/libgtk-x11-2.0.so.0
#28 0xb7d8c12f in gtk_window_propagate_key_event ()
   from /usr/lib/libgtk-x11-2.0.so.0
#29 0xb7d8f39c in gtk_window_key_press_event ()
   from /usr/lib/libgtk-x11-2.0.so.0
#30 0xb7c51156 in _gtk_marshal_BOOLEAN__BOXED ()
   from /usr/lib/libgtk-x11-2.0.so.0
#31 0xb75b4389 in g_type_class_meta_marshal ()
   from /usr/lib/libgobject-2.0.so.0
#32 0xb75b5c3b in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0
#33 0xb75c9e7f in signal_emit_unlocked_R () from /usr/lib/libgobject-2.0.so.0
#34 0xb75cb50c in g_signal_emit_valist () from /usr/lib/libgobject-2.0.so.0
#35 0xb75cbae6 in g_signal_emit () from /usr/lib/libgobject-2.0.so.0
#36 0xb7d79fde in gtk_widget_event_internal ()
   from /usr/lib/libgtk-x11-2.0.so.0
#37 0xb7c49e81 in gtk_propagate_event () from /usr/lib/libgtk-x11-2.0.so.0
#38 0xb7c4b09f in gtk_main_do_event () from /usr/lib/libgtk-x11-2.0.so.0
#39 0xb7abaa9a in gdk_event_dispatch () from /usr/lib/libgdk-x11-2.0.so.0
#40 0xb75042d9 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#41 0xb750785b in g_main_context_iterate () from /usr/lib/libglib-2.0.so.0
---Type <return> to continue, or q <return> to quit---
#42 0xb7507d2a in g_main_loop_run () from /usr/lib/libglib-2.0.so.0
#43 0xb7c4b5d9 in gtk_main () from /usr/lib/libgtk-x11-2.0.so.0
#44 0xb80460fe in main (argc=1634430800, argv=0xbff8fec4) at gtkmain.c:888