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 ('a9f89a72c40f6af2693dbf74471ccad9', -1, 1714005989, 1714005989, '2cc961e0', -4, 0, 0)

Line : 187
File : sessions.php