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 ('786024df3d479c4ed01b5e5f1c486e2e', -1, 1711720793, 1711720793, '2cc88d7a', -7, 0, 0)

Line : 187
File : sessions.php