phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'b6f017dde788557128a53b9d68f112cc' for key 'PRIMARY'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in) VALUES ('b6f017dde788557128a53b9d68f112cc', -1, 1770359152, 1770359152, 'd849d802', -9, 0)

Line : 180
File : /www/includes/sessions.php