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 ('816d41623d983862038351e43ec225ba', '1', '1513608114', '1513608114', '36dd49ba', '53', '0', '0')

Line : 207
File : sessions.php