Error for user when trying to sign up as a player

A user informed me he was unable to add himself as a player to The Great Battles of Alexander: Expanded Deluxe Edition - Great Battles of History Volume I

User name is Penry

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Error is: APIError: 500 Internal Server Error: error returned from database: (code: 787) FOREIGN KEY constraint failed

I advised him to log out and back in, but he got the same error.

Try now.

New users are only being added to the users table in the GLS manually right now, and I hadn’t done it for a few days.

Adding new users automatically is this issue, which no one has worked on yet.