Custom resolvers don't work if no node with GraphQL type as Label exists

Example:

Given the following Graphql schema

type Thing {

    "A property"
    foo: String @customResolver
}

And custom resolver

export const resolvers = {
    Thing: {
        foo: () => { return "bar"}
    }
}

The query

query Query {
  things {
    foo
  }
}

will return

{
  "data": {
    "things": [
      {
        "foo": []
      }
    ]
  }
}

instead of

{
  "data": {
    "things": [
      {
        "foo": "bar"
      }
    ]
  }
}

Until a node Thing is added to the neo4j graph (with MERGE (n:Thing) RETURN n;)