Comment 2 for bug 907631

StacktraceTop:
 got_public_files_cb (proxy=0xb4c35d50, files=0x0, user_data=0x97d5498) at syncdaemon-publicfiles-interface.c:90
 g_cclosure_marshal_VOID__POINTER (closure=0x98e6ec0, return_value=0x0, n_param_values=2, param_values=0x98e2430, invocation_hint=0xbff99a00, marshal_data=0x0) at /build/buildd/glib2.0-2.31.4.tested/./gobject/gmarshal.c:609
 marshal_dbus_message_to_g_marshaller (closure=0x98e6ec0, return_value=0x0, n_param_values=3, param_values=0x9750560, invocation_hint=0xbff99a00, marshal_data=0x0) at dbus-gproxy.c:1734
 g_closure_invoke (closure=0x98e6ec0, return_value=0x0, n_param_values=3, param_values=0x9750560, invocation_hint=0xbff99a00) at /build/buildd/glib2.0-2.31.4.tested/./gobject/gclosure.c:774
 signal_emit_unlocked_R (node=0x9748fa8, detail=1719, instance=0xb4c35d50, emission_return=0x0, instance_and_params=0x9750560) at /build/buildd/glib2.0-2.31.4.tested/./gobject/gsignal.c:3302