.
Thread 1 (Thread 0x7fade2f427c0 (LWP 1625)):
#0  0x00007fade16333a5 in __GI_raise (sig=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:64
        resultvar = 0
        pid = <optimized out>
        selftid = <optimized out>
#1  0x00007fade1636b0b in __GI_abort () at abort.c:92
        save_stage = 2
        act = {__sigaction_handler = {sa_handler = 0, sa_sigaction = 0}, sa_mask = {__val = {140384787732349, 140384787250080, 140384813752320, 1024, 0, 39189376, 39189376, 4294967295, 140384790999488, 39187792, 39187792, 3100736, 0, 140384794121840, 39081936, 140384791019520}}, sa_flags = -489332812, sa_restorer = 0x1}
        sigs = {__val = {32, 0 <repeats 15 times>}}
#2  0x00007fade1a04b9d in g_assertion_message (domain=<optimized out>, file=<optimized out>, line=<optimized out>, func=0x454cc0 "_mcd_client_proxy_handler_get_all_cb", message=0x2559930 "assertion failed: (self->priv->unique_name != NULL)") at /build/buildd/glib2.0-2.29.16/./glib/gtestutils.c:1425
        lstr = "667\000\377\177\000\000P/\257\252\377\177\000\000\000zU\002\000\000\000\000pEE\000\000\000\000"
        s = 0x255f550 ""
#3  0x00007fade1a050c2 in g_assertion_message_expr (domain=0x446aa1 "mcd", file=0x45407a "mcd-client.c", line=667, func=0x454cc0 "_mcd_client_proxy_handler_get_all_cb", expr=<optimized out>) at /build/buildd/glib2.0-2.29.16/./glib/gtestutils.c:1436
        s = <optimized out>
#4  0x000000000043f6c6 in _mcd_client_proxy_handler_get_all_cb (proxy=<optimized out>, properties=0x255e300, error=0x0, p=<optimized out>, o=<optimized out>) at mcd-client.c:667
        self = 0x255b050
        bus_name = 0x255acd0 "org.freedesktop.Telepathy.Client.GnomeShell._3a1_2e21.n0"
        filters = <optimized out>
        handled_channels = <optimized out>
        bypass = <optimized out>
        __PRETTY_FUNCTION__ = "_mcd_client_proxy_handler_get_all_cb"
#5  0x00007fade2890ba8 in _tp_cli_dbus_properties_invoke_callback_get_all (self=0x255b050, error=0x0, args=0x2565f60, generic_callback=0x43f490 <_mcd_client_proxy_handler_get_all_cb>, user_data=<optimized out>, weak_object=<optimized out>) at _gen/tp-cli-generic-body.h:1190
        callback = 0x43f490 <_mcd_client_proxy_handler_get_all_cb>
#6  0x00007fade2897a80 in tp_proxy_pending_call_idle_invoke (p=0x25640c0) at proxy-methods.c:153
        pc = 0x25640c0
        invoke = <optimized out>
        __PRETTY_FUNCTION__ = "tp_proxy_pending_call_idle_invoke"
#7  0x00007fade19e0efd in g_main_dispatch (context=0x25457d0) at /build/buildd/glib2.0-2.29.16/./glib/gmain.c:2439
        dispatch = 0x7fade19dcc50 <g_idle_dispatch>
        was_in_call = 0
        user_data = 0x25640c0
        callback = 0x7fade2897a10 <tp_proxy_pending_call_idle_invoke>
        cb_funcs = 0x7fade1c91670
        cb_data = 0x255c980
        current_source_link = {data = 0x2558920, next = 0x0}
        need_destroy = <optimized out>
        source = 0x2558920
        current = 0x25557a0
        i = <optimized out>
#8  g_main_context_dispatch (context=0x25457d0) at /build/buildd/glib2.0-2.29.16/./glib/gmain.c:3008
No locals.
#9  0x00007fade19e16f8 in g_main_context_iterate (context=0x25457d0, block=<optimized out>, dispatch=1, self=<optimized out>) at /build/buildd/glib2.0-2.29.16/./glib/gmain.c:3086
        max_priority = -100
        timeout = 0
        some_ready = 1
        nfds = 0
        allocated_nfds = <optimized out>
        fds = <optimized out>
#10 0x00007fade19e1c32 in g_main_loop_run (loop=0x2540b90) at /build/buildd/glib2.0-2.29.16/./glib/gmain.c:3294
        __PRETTY_FUNCTION__ = "g_main_loop_run"
#11 0x000000000040e9e5 in main (argc=<optimized out>, argv=<optimized out>) at mc-server.c:78
        mcd = 0x254c810