Slow performance - "message" ''Undefined index''

I am receiving many errors like the ones below in the nextcloud log

{“reqId”:“wX5mqL7pwFiDNtVy5I3O”,“level”:3,“time”:“2022-08-16T01:51:09+03:00”,“remoteAddr”:“188.54.252.247”,“user”:“hisham”,“app”:“PHP”,“method”:“POST”,“url”:“/nextcloud/index.php/apps/text/session/sync”,“message”:“Undefined index: HTTP_REFERER at /var/www/nextcloud/index.php#17”,“userAgent”:“Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.0.0 Safari/537.36”,“version”:“24.0.2.1”}

Could this be causing a slow response from Nextcloud ?

I am running Nextcloud version 24.0.2 on an Ubuntu 20.04