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 ('bac1a9321a41b18b20084bb54b5265bb', -1, 1711695722, 1711695722, '2cd2ebf7', 4, 0, 0)

Line : 187
File : sessions.php