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 ('16e9f0f1f138c24e1052a038cd3bae2b', -1, 1711615315, 1711615315, '2cc84d3b', -7, 0, 0)

Line : 187
File : sessions.php