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 ('4ff99d79388b83619a551c55a77036b9', -1, 1711656902, 1711656902, '03ec3789', -7, 0, 0)

Line : 187
File : sessions.php