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 ('518327c2f8cbe49e79c4b17b6059bbe4', -1, 1635047642, 1635047642, '03ebb36f', -8, 0, 0)

Line : 187
File : sessions.php