Hmm.. we'll have to check why that's throwing the error. We specifically tested that query with Postgre (I remember, it was a pain).
Either way, no, you shouldn't have to 'fix' anything. Please check the "Enable Automatic Registration" setting in the JFBConnect -> Configuration area. That SQL query was meant to flip the setting value because of how we use it now. Just make sure Auto Registration is configured however you want it to work.
Thanks,
Alex