From gnome-terminal in https://retrace.fedoraproject.org/faf/problems/1665546/ :

4 	g_assertion_message_error 	/usr/lib64/libglib-2.0.so.0 	/gtestutils.c 	2397
5 	g_dbus_object_manager_server_emit_interfaces_removed 	/usr/lib64/libgio-2.0.so.0 	/usr/src/debug/glib-2.40.0/gio/gdbusobjectmanagerserver.c 	966

I think that's the g_assert_no_error() here (line number shown is at the end of the function, perhaps due to inlining?):

   g_dbus_connection_emit_signal (data->manager->priv->connection,
                                 NULL, /* destination_bus_name */
                                 manager->priv->object_path,
                                 manager_interface_info.name,
                                 "InterfacesRemoved",
                                 g_variant_new ("(oas)",
                                                object_path,
                                                &array_builder),
                                 &error);
  g_assert_no_error (error);


No info on what the error msg was... perhaps similar to bug 719402 which was for the gdbusobjectmanagerclient ? Or this is the last terminal tab and the app is already shutting down, bus connection closed?