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 ('ef648aa1f1d3c89283e5dab8288d2b0b', -1, 1714005794, 1714005794, '0387cae0', 6, 0, 0)

Line : 187
File : sessions.php