How can I fix the error: Queue::list(): Argument #1 ($queue_name) must be of type string, null given when selecting all from the select list on the queue page?

When selecting "all" from the Warden -> Queue select list on the queue page you get the error:

Status: 500 - Internal Server Error
TypeError [ 0 ]: Queue::list(): Argument #1 ($queue_name) must be of type string, null given
called in /opt/psa/admin/plib/modules/warden/library/application/classes/Model/Queue.php on line 28

This has been fixed in the latest version of Warden. You can upgrade to it using the command:

plesk bin extension --install-url https://www.danami.com/clients/downloads/warden.zip
  • queue, $queue_name
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