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 ('233cb59708f4d76c2d311ed5ed9be242', -1, 1711702650, 1711702650, '641a87fc', -4, 0, 0)

Line : 187
File : sessions.php