phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '-1' for key 'phpbb_sessions.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 ('09caa944d84fb3ee0fd799c8aef4b55f', -1, 1664242986, 1664242986, '12d0bb80', -8, 0, 0)

Line : 187
File : sessions.php