ERR_NGROK_SHIP_ROLLBACK_RELEASE_NOT_FOUND: Deployment ID has no release to roll back to - ngrok documentation

What does ERR_NGROK_SHIP_ROLLBACK_RELEASE_NOT_FOUND mean?

ngrok returns ERR_NGROK_SHIP_ROLLBACK_RELEASE_NOT_FOUND with this message:

Deployment <ID> has no release to roll back to.

Where can I get more help with ERR_NGROK_SHIP_ROLLBACK_RELEASE_NOT_FOUND?

Email support@ngrok.com and include the error code.