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 ('994a859b1fa68d84b3ae475750b0c7e3', -1, 1713570971, 1713570971, '1275c4b8', -1, 0, 0)

Line : 187
File : sessions.php