user registration fails - have to edit database

[tex]

when a new user registers to my gallery, a new record in users table with user id = 0 is inserted. I manually have to change user id to something different from 0. Otherwise no further registrations are possible. Any hints?

[Nibbler]

Make sure the user_id is set to auto_increment.

[tex]

Thanks, this worked. I installed locally, then moved everything to my isp and updated the database via phpMyAdmin and a sql backup. Seems I have missed something.