phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '1' for key 'session_user_id'

INSERT INTO sajjad_bbsessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('d0e853aa648532bafb1e51cbff180cd7', '1', '1513574253', '1513574253', '36a0f579', '76', '0', '0')

Line : 207
File : sessions.php