phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '-1' for key 'session_user_id'

INSERT INTO phpbb2_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('1691bdc52c40a02332431f1e1d68623f', -1, 1596729467, 1596729467, '03eb6bd1', 0, 0, 0)

Line : 187
File : sessions.php