After switching hosting type from Website hosting to forwarding and back to Website hosting, the following error displays:
Unable to find service node for ip address with id=
/usr/local/psa/admin/logs/panel.logthe Plesk tries to execute the query with empty value of one of its arguments:
SELECT `s`.* FROM `ServiceNodes` AS `s` INNER JOIN `IP_Addresses` AS `ip` ON ip.serviceNodeId = s.id WHERE (ip.id = '') LIMIT 1
The behavior is caused by software issue #PPA-1672. The fix is included in Plesk Automation MU#7.
Install latest PA updates according to the article.