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 ('50401dcb8540558031644c09d62f81be', -1, 1604014771, 1604014771, '23aa4e8e', 32, 0, 0)

Line : 187
File : sessions.php