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 ('b0f7af1e2a630c2e3ed6315c78a63df7', -1, 1581985810, 1581985810, '03e9dd95', 16, 0, 0)

Line : 191
File : sessions.php