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 ('f2b208d2f2d80df3b26cd1c001a9c866', -1, 1581899726, 1581899726, '03ead042', 8, 0, 0)

Line : 191
File : sessions.php