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 ('502caae0a07c6e856f9cfa54498c3183', -1, 1586368875, 1586368875, '03e2f324', 0, 0, 0)

Line : 187
File : sessions.php