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 ('5d2fce2a5e519023f4682880d4cd9643', -1, 1756310565, 1756310565, 'd849d886', -9, 0, 0)

Line : 187
File : sessions.php