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 ('19dff62c526be0e0b708708e4ce51dc8', -1, 1615284168, 1615284168, '03ef9e24', -20, 0, 0)

Line : 189
File : sessions.php