Steps to reproduce

1. Install Ibexa DXP
2. Add a new language e.g. pol-PL (BO and yaml file)
3. regenerate graphQL schema
4. execute query:

   {
     content {
       folder(contentId: 1) {
         name: name(language: pol_PL)
       }
     }
   } 

    

Result

in dev mode, we get an error

get_object_vars(): Argument #1 ($object) must be of type object, null given 

Expected

The field should be returned as empty