phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '-1' for key 'session_user_id'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('1a08ffd0dc10f4678c7a5615ef5a2d79', -1, 1713474862, 1713474862, '030e46cb', -4, 0, 0)

Line : 187
File : sessions.php