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 ('de864ad18398ce906765b56a390ed1ba', -1, 1714007413, 1714007413, '340f3ba3', 6, 0, 0)

Line : 187
File : sessions.php