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 ('a96045a97c6310dba1dbafa71df17428', -1, 1708984215, 1708984215, '2cc00ffb', -4, 0, 0)

Line : 187
File : sessions.php