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 ('c354a913da712bf201edc7906ab8da32', -1, 1711719617, 1711719617, '22cfb48d', 6, 0, 0)

Line : 187
File : sessions.php