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 ('40c71a654b4b31669560eb6b7f5a4909', -1, 1711721509, 1711721509, '03ead4fd', 2, 0, 0)

Line : 187
File : sessions.php