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 ('fa72acb1f550c9a877d5727a9d7ffbbd', -1, 1714000925, 1714000925, '12d9c227', -8, 0, 0)

Line : 187
File : sessions.php