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 ('a48a009874fe3e77cc9a727b454e2383', -1, 1713564712, 1713564712, '1276c1e8', 2, 0, 0)

Line : 187
File : sessions.php