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 ('85e94feb9c9a554813d5c928a340e3c1', -1, 1714003924, 1714003924, '12742ad0', -4, 0, 0)

Line : 187
File : sessions.php