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 ('5d7ce57dcedba3a95e9b6a15edbd4edd', -1, 1582509879, 1582509879, '03e27a4a', 0, 0, 0)

Line : 191
File : sessions.php