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 ('a183691fa5df6a9864c9f75c500d4170', -1, 1757040908, 1757040908, 'd849d80f', -9, 0, 0)

Line : 247
File : sessions.php