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 ('6ff0751d94a604df2824f4a3cfed5f87', -1, 1638165794, 1638165794, '22cff745', -4, 0, 0)

Line : 187
File : sessions.php