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 ('8f0271abd58fa5d40bfdd30dc7aa5f06', -1, 1714020648, 1714020648, '0391bfa9', -4, 0, 0)

Line : 187
File : sessions.php