Hi, I have this model

type Poi {
  id: ID! @id
  title: String!
  address: PoiAddress
}

type PoiAddress {
  id: ID! @id
  address1: String
  address2: String
  zipcode: String
  country: String
}

Now I want all Poi's wich don't have an address. I tried

prisma.pois({
            where : {
                address : {
                    country: null
                }
            }
        });

But that gave me an empty response. Any ideas?