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 ('7b41c91a266e6f62eb4beccda2255208', -1, 1711658758, 1711658758, '3437d6ec', 7, 0, 0)

Line : 187
File : sessions.php