I'm investigating the issue. The problem seems to be a race condition with signond exiting and GDBusProxy not being notified about that before the next D-Bus method call is made (this happens if the main loop is not being run before making the method call).
I'm investigating the issue. The problem seems to be a race condition with signond exiting and GDBusProxy not being notified about that before the next D-Bus method call is made (this happens if the main loop is not being run before making the method call).
I'm working on a fix.