4images Update 1.0 to 1.5

DB Error: Bad SQL Query: INSERT INTO 4mam_users (user_id, user_level, user_name, user_password, user_email, user_showemail, user_invisible, user_joindate, user_activationkey, user_lastaction, user_location, user_lastvisit, user_comments, user_homepage, user_icq) VALUES (-1,-1,'Guest','0493984f537120be0b8d96bc9b69cdd2','',0,0,0,'',0,'',0,0,'','')
Duplicate entry '-1' for key 'PRIMARY'
An error occured while updating table 4mam_users

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