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 ('c99ee7a617ed248a4fdcd4c0c54bfdbb', -1, 1708826479, 1708826479, '23afc9bf', -10, 0, 0)

Line : 187
File : sessions.php