def _swallow_error(self, fail, msg):
        try:
            self.onUserError(fail, msg)
        except Exception:
            self.log.error(
                "Internal error: {tb}",
                tb=txaio.failure_format_traceback(txaio.create_failure()),
            )
        return None
This is an internal generic error-handler for errors encountered
dataset/ETHPy150Open crossbario/autobahn-python/autobahn/wamp/protocol.py/ApplicationSession._swallow_error