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 ('4e40d2ef546f6cba4d9ef903d46e5b9e', -1, 1713883396, 1713883396, '0390d491', -6, 0, 0)

Line : 187
File : sessions.php