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 ('abc8e2fe7ba026a78e85cb660a627648', -1, 1713466920, 1713466920, '0391a46a', -4, 0, 0)

Line : 187
File : sessions.php