Comment 2 for bug 1272801

StacktraceTop:
 g_type_check_instance (type_instance=type_instance@entry=0x21) at /build/buildd/glib2.0-2.39.3/./gobject/gtype.c:4080
 g_signal_handler_disconnect (instance=0x21, handler_id=140351430766768) at /build/buildd/glib2.0-2.39.3/./gobject/gsignal.c:2572
 on_connection_disconnected (connection=<optimized out>, remote_peer_vanished=<optimized out>, error=<optimized out>, user_data=0x17bb9c0) at /build/buildd/glib2.0-2.39.3/./gio/gdbusnamewatching.c:260
 ffi_call_unix64 () at ../src/x86/unix64.S:76
 ffi_call (cif=cif@entry=0x7fa61a716850, fn=0x7fa61d2f1680 <on_connection_disconnected>, rvalue=0x7fa61a7167c0, avalue=avalue@entry=0x7fa61a716760) at ../src/x86/ffi64.c:522