Error trying to search for a lookup column value

I am currently working on setting up a My Search webpart in Sharepoint on premise, but I keep getting an unknown error.

The lookup column I am trying to search was named "name" on the first list it was added to, and named "DepartmentId" on the list that I am trying to pull from. Do columns have to be named the same for the search results to display properly?

Here's the query template I am using:

{searchTerms}
path:http://website/Lists/Employees/

DepartmentId:*

The strange part is that I added the column "DepartmentId" to the Manage Columns section of the webpart and the department column will populate when I don't try filtering for it on the query template, but will cause the error when I add to the query template.

Here's the error I am getting: