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 ('c8bffa9bceca2dd139f491ec1abe0526', -1, 1714040627, 1714040627, '0d3b8282', -4, 0, 0)

Line : 187
File : sessions.php