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 ('f7f358bc1c6b38e3e5b95a3b77d4f20c', -1, 1713627195, 1713627195, '0387d9e4', -8, 0, 0)

Line : 187
File : sessions.php