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 ('4e69ac3c1b7e4d92202305a442abe1d1', -1, 1638209471, 1638209471, '36eabfca', 46, 0, 0)

Line : 187
File : sessions.php