Since 4.12 update, we're seeing "PHP notice: Undefined index: excluded_referrers"

Hi,

since the 4.12 update, we’re getting the following notice both in the PHP log and from one of our cronjobs:

PHP Notice: Undefined index: excluded_referrers in /tools/piwik/piwik-4.12.1/plugins/SitesManager/SitesManager.php on line 320

2022-10-25 00:02:07,808: [INFO] bulk tracking returned invalid JSON
2022-10-25 00:02:07,808: [INFO] tracker response:
<br />
<b>Notice</b>:  Undefined index: excluded_referrers in
<b>/tools/piwik/piwik-4.12.1/plugins/SitesManager/SitesManager.php</b>
on line <b>320</b><br />

I’m at a loss as to what could cause this. It seems the error stems from a Matomo PHP file (SitesManager.php). I gather excluded referrers are a new feature. I found no previous case of this problem on Google.

Could someone more knowledgeable than me take a look at this?

Sincerely,
Jonas

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