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 ('a546e0071fa9f0474f33939f816c2ae6', -1, 1711722231, 1711722231, '03ee40c9', 4, 0, 0)

Line : 187
File : sessions.php