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 ('2f6815042339253e98795f46da26671d', -1, 1714004472, 1714004472, '12dc6af1', -8, 0, 0)

Line : 187
File : sessions.php