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 ('571d2cc6a3f6d973610460de6e17420d', -1, 1597478966, 1597478966, '03dba7c2', 4, 0, 0)

Line : 187
File : sessions.php