Hi @anthony8824 and welcome to the Auth0 Community! 
Which custom social connection did you configure? Can you confirm that it was set up according to our documentation here:
https://auth0.com/docs/extensions/custom-social-extensions
You mentioned that this connection was previously working, were any changes made on your side prior to this connection seemingly breaking? From the error it sounds like there may be an issue with the Fetch User profile script you have for this particular connection. I’d recommend reviewing that piece of code to ensure it’s returning the information you’re expecting.
Best Regards,
Colin