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 ('a5c6bde5194f7a02fbdf435d6a772b86', '1', '1513601582', '1513601582', '36a0f579', '25', '0', '0')

Line : 207
File : sessions.php