Recently (I suspect since I updated libtelepathy-glib to version 0.15), Empathy sometimes crashes with this backtrace:

Program terminated with signal 11, Segmentation fault.
#0  tp_proxy_get_object_path (self=<value optimized out>) at proxy.c:1444
1444	proxy.c: No such file or directory.
	in proxy.c
(gdb) thread apply all bt

Thread 1 (Thread 15616):
#0  tp_proxy_get_object_path (self=<value optimized out>) at proxy.c:1444
#1  0x000000000046ec99 in dispatcher_connection_new_channel (handler=<value optimized out>, account_path=<value optimized out>, 
    connection_path=<value optimized out>, channels=0x357dae0, requests_satisfied=0x357dae0, timestamp=<value optimized out>, 
    handler_info=0x37c5320, user_data=0x1d75c40, error=0x7fffda003d58) at empathy-dispatcher.c:654
#2  dispatcher_connection_new_channel_with_properties (handler=<value optimized out>, account_path=<value optimized out>, 
    connection_path=<value optimized out>, channels=0x357dae0, requests_satisfied=0x357dae0, timestamp=<value optimized out>, 
    handler_info=0x37c5320, user_data=0x1d75c40, error=0x7fffda003d58) at empathy-dispatcher.c:733
#3  empathy_dispatcher_handle_channels (handler=<value optimized out>, account_path=<value optimized out>, 
    connection_path=<value optimized out>, channels=0x357dae0, requests_satisfied=0x357dae0, timestamp=<value optimized out>, 
    handler_info=0x37c5320, user_data=0x1d75c40, error=0x7fffda003d58) at empathy-dispatcher.c:2202
#4  0x00000000004aa72d in empathy_handler_handle_channels (self=0x1d98520, 
    account_path=0x371a3e0 "/org/freedesktop/Telepathy/Account/butterfly/msn/freggy1_40gmx_2enet0", 
    connection_path=0x3844040 "/org/freedesktop/Telepathy/Connection/butterfly/msn/freggy1_40gmx_2enet", channels=0x357dae0, 
    requests_satisfied=0x3823ce0, timestamp=<value optimized out>, handler_info=0x37c5320, context=0x371a430) at empathy-handler.c:364
#5  0x00007f1a66826f87 in _tp_marshal_VOID__BOXED_BOXED_BOXED_BOXED_UINT64_BOXED_POINTER (closure=0x7fffda003f40, 
    return_value=<value optimized out>, n_param_values=<value optimized out>, param_values=0x384ce00, invocation_hint=<value optimized out>, 
    marshal_data=<value optimized out>) at _gen/signals-marshal.c:450
#6  0x00007f1a66f28c80 in ?? () from /usr/lib/libdbus-glib-1.so.2
#7  0x00007f1a66cf3831 in _dbus_object_tree_dispatch_and_unlock (tree=0x1d8c270, message=0x36896a0) at dbus-object-tree.c:858
#8  0x00007f1a66ce5472 in dbus_connection_dispatch (connection=0x1d8c5b0) at dbus-connection.c:4688
#9  0x00007f1a66f258c5 in ?? () from /usr/lib/libdbus-glib-1.so.2
#10 0x00007f1a5f97e4a3 in g_main_dispatch (context=0x19ad9d0) at /tmp/buildd/glib2.0-2.28.6/./glib/gmain.c:2440
#11 g_main_context_dispatch (context=0x19ad9d0) at /tmp/buildd/glib2.0-2.28.6/./glib/gmain.c:3013
#12 0x00007f1a5f97ec80 in g_main_context_iterate (context=0x19ad9d0, block=1, dispatch=1, self=<value optimized out>)
    at /tmp/buildd/glib2.0-2.28.6/./glib/gmain.c:3091
#13 0x00007f1a5f97f2f2 in g_main_loop_run (loop=0x1fa29e0) at /tmp/buildd/glib2.0-2.28.6/./glib/gmain.c:3299
#14 0x00007f1a622f22b7 in IA__gtk_main () at /scratch/build-area/gtk+2.0-2.24.4/gtk/gtkmain.c:1256
#15 0x000000000043fc4b in main (argc=1, argv=0x7fffda004798) at empathy.c:709

I'm using Debian AMD64 with these packages installed:
ii  empathy                                      2.30.3-1+b2                       GNOME multi-protocol chat and call client
ii  empathy-common                               2.30.3-1                          GNOME multi-protocol chat and call client (common files)
ii  empathy-dbg                                  2.30.3-1+b2                       GNOME multi-protocol chat and call client (debug symbols)
ii  libmission-control-plugins0                  1:5.9.0-1                         management daemon for Telepathy (library for plugins)
ii  libtelepathy-farsight0                       0.0.16+is.0.0.14-1                Glue library between telepathy and farsight2
ii  libtelepathy-glib0                           0.15.0-1                          Telepathy framework - GLib library
ii  libtelepathy-glib0-dbg                       0.15.0-1                          GLib Telepathy library (debug symbols)
ii  nautilus-sendto-empathy                      2.30.3-1+b2                       GNOME multi-protocol chat and call client (nautilus-sendto plugin)
ii  python-telepathy                             0.15.19-2.1                       Python language bindings for telepathy
ii  remmina-plugin-telepathy                     0.9.2-2                           Telepathy plugin for remmina remote desktop client
ii  telepathy-butterfly                          0.5.15-2.1                        MSN connection manager for Telepathy
ii  telepathy-gabble                             0.12.0-1                          Jabber/XMPP connection manager
ii  telepathy-mission-control-5                  1:5.9.0-1                         management daemon for Telepathy real-time communication framework
ii  telepathy-salut                              0.5.0-1                           Link-local XMPP connection manager for the Telepathy framework
ii  telepathy-sofiasip                           0.6.3-1                           SIP connection manager for the Telepathy framework