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 ('9c1a32843a0b0792c60bb3e4c285626c', -1, 1713971998, 1713971998, '2cc96100', -7, 0, 0)

Line : 187
File : sessions.php