Look like a crawler-bot (e.g. for Search-Engines) is triggering this.
HTTP_USER_AGENT = 'Mozilla/5.0 (compatible; SemrushBot/7~bl;
+http://www.semrush.com/bot.html)'
Not sure though, how they harvested the URL that is triggering the error. Maybe
that URL is exposed somewhere, e.g. in Postorius or Hyperkitty.
Easy mitigation is to add a robots.txt with the following content to your site:
```
User-agent: *
Disallow: /
```
i.e. 'https://<your_site_url>/robots.txt' should return the above (or sth.
alike).
I added an Alias pointing to a 'robots.txt' file to the apache2 config, e.g.:
```
Alias /robots.txt /var/www/robots/robots.txt
```
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