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 ('d579aaaf7df2e5d8e0420b31c6a495d6', -1, 1714008118, 1714008118, '0d3afc08', -4, 0, 0)

Line : 187
File : sessions.php