Process Builder Error: variable hasn't been set or assigned. - Answers - Salesforce Trailblazer Community

Hello,<br><br>In the Process Builder have criteria to check if the Leads upon creation/edit was assigned to a specific Queue, then sending email.<br>In the case if the lead owner is Queue, the process does not give any errors.<br>However if later the user changes Lead Owner from Queue to a regular User, getting th…