pyGIOBoggusGI_IS_CALLABLE_INFO

#I have many instance of this object
class BlargProblematic(object):
    #nothing wrong where
    def __init__(self, con, rule):
        self.con = con #GDBusConnection
        self.rule = rule #string
        proxy = Gio.DBusProxy.new_sync(
                self.con, #cpmmectopm
                Gio.DBusProxyFlags.NONE,
                None, #DBusInterfaceInfo
                "org.freedesktop.DBus", #name
                "/", #path
                "org.freedesktop.DBus", #iface
                None)
        proxy.AddMatch("(s)", self.rule)

    # something goes wrong here :/
    def __del__(self):
        proxy = Gio.DBusProxy.new_sync(
                self.con, #cpmmectopm
                Gio.DBusProxyFlags.NONE,
                None, #DBusInterfaceInfo
                "org.freedesktop.DBus", #name
                "/", #path
                "org.freedesktop.DBus", #iface
                None)
        proxy.RemoveMatch(self.rule)


#I have many instance of this object too
class BlargTestingSolution(object):
    #nothing wrong here
    def __init__(self, con, rule):
        self.con = con #GDBusConnection
        self.rule = rule #string
        self.proxy = Gio.DBusProxy.new_sync(
                self.con, #cpmmectopm
                Gio.DBusProxyFlags.NONE,
                None, #DBusInterfaceInfo
                "org.freedesktop.DBus", #name
                "/", #path
                "org.freedesktop.DBus", #iface
                None)
        self.proxy.AddMatch("(s)", self.rule)

    # (probably) nothing wrong here (I'm testing)
    def __del__(self):
        self.proxy.RemoveMatch(self.rule)