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 ('d2988b0749ea05d46885f8e6e9b721cf', -1, 1627893583, 1627893583, '03ec7c38', -8, 0, 0)

Line : 187
File : sessions.php