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 ('1938799e1ccb9021ce12954096b1aa86', -1, 1711676183, 1711676183, '03ebf9db', 6, 0, 0)

Line : 187
File : sessions.php