ERR_NGROK_SHIP_ENVIRONMENT_VAR_KEY_REQUIRED: Environment variable names must not be empty - ngrok documentation

What does ERR_NGROK_SHIP_ENVIRONMENT_VAR_KEY_REQUIRED mean?

ngrok returns ERR_NGROK_SHIP_ENVIRONMENT_VAR_KEY_REQUIRED with this message:

Environment variable names must not be empty.

Where can I get more help with ERR_NGROK_SHIP_ENVIRONMENT_VAR_KEY_REQUIRED?

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