Strange error, might be a bug, it considers action_listen as a Custom Action

I found error while I was performing interactive training of my core model.

? What is the next action of the bot? 1.00 action_listen Thanks! The bot will now run action_listen.

2018-11-20 10:21:57 ERROR rasa_core.processor - Encountered an exception while running action ‘action_listen’. Bot will continue, but the actions events are lost. Make sure to fix the exception in your custom code. 2018-11-20 10:21:57 ERROR rasa_core.processor - The model predicted the custom action ‘action_listen’ but you didn’t configure an endpoint to run this custom action. Please take a look at the docs and set an endpoint configuration. Actions