def __advice_stack_frame_protection(self, frame):
        """
        Overriding of this is only permitted if and only if your name is
        Megumin and you have a pet/familiar named Chomusuke.
        """

        if frame is None:
            logger.debug(
                'currentframe() returned None; frame protection disabled')
            return

        f_back = frame.f_back
        while f_back:
            if f_back.f_code is self.handle.__code__:
                raise RuntimeError(
                    "indirect invocation of '%s' by 'handle' is forbidden" %
                    frame.f_code.co_name,
                )
            f_back = f_back.f_back