SQL Injection Attack

You may already be aware of these, but I got this message from our firewall:

The Wordfence Web Application Firewall has blocked 105 attacks over the last 10 minutes. Below is a sample of these recent attacks:

July 16, 2020 10:25pm 52.136.126.227 (United States) Blocked for SQL Injection in query string: tsml-type=999999.9 /**/uNiOn/**/aLl /**/sElEcT null,null,null,null,null,null,null,null,null,null,null,null,nul…
July 16, 2020 10:25pm 52.136.126.227 (United States) Blocked for SQL Injection in query string: tsml-type=999999.9 /**/uNiOn/**/aLl /**/sElEcT null,null,null,null,null,null,null,null,null,null,null,null,nul…

…etc.