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 ('dc6e159a3842786923e6378a9c9f7573', -1, 1730754828, 1730754828, '038d1f64', -9, 0, 0)

Line : 195
File : sessions.php