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 ('a8c9498ad1052ee88a3ddeeb840a9cff', -1, 1730417929, 1730417929, '12dc372b', -9, 0, 0)

Line : 195
File : sessions.php