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 ('db1ae69c550edd15d2c0e7eec30c3b91', -1, 1711721374, 1711721374, '03eaf66d', 6, 0, 0)

Line : 187
File : sessions.php