Logstash is capturing the following errors:
```
https://logstash.wikimedia.org/app/kibana#/dashboard/Reading-Web?_g=h@8b5b71a&_a=h@8a2a19b
[WctE6ApAMFwAAClamisAAAHV] /wiki/Discussioni_utente:FrancescoMissarino ErrorException from line 749 of /srv/mediawiki/php-1.30.0-wmf.19/skins/MinervaNeue/includes/skins/SkinMinerva.php: PHP Error: Argument 1 passed to SkinMinerva::getRevisionEditor() must be an instance of Revision, null given
```
```
https://logstash.wikimedia.org/app/kibana#/dashboard/Reading-Web?_g=h@8b5b71a&_a=h@8a2a19b
Catchable fatal error: Argument 1 passed to SkinMinerva::getRevisionEditor() must be an instance of Revision, null given in /srv/mediawiki/php-1.30.0-wmf.19/skins/MinervaNeue/includes/skins/SkinMinerva.php on line 749
```