Is this an Airtable Bug? or incorrect expression

We are using the Airtable Plugin to send emails from bubble to Airtable

We have go the email sending across ok

However the yes / no input is throwing back a bug error on preview

We have set the yes no imput in the data type for this workflow

Not sure if this is a bug or if we are using the wrong expression?

The debugger says it is a bubble bug?

Screen Shot 2021-04-14 at 11.17.37 Screen Shot 2021-04-14 at 11.07.31