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 ('441cfd48c8cdec2f51a4a765e4e00439', -1, 1571239518, 1571239518, '03e3e94e', 30, 0, 0)

Line : 191
File : sessions.php