Fragment on Query still not working

[ima9dan]

When having something like:

query{
  ...countrysightings
}

fragment countrysightings on Query{
  topCountrySightings{
    country
    numOccurrences
    state
  }
}

Intended outcome:
We should get the same result as if we called

{
  "data": {
    "topCountrySightings": [
      {
        "country": "us",
        "numOccurrences": 8021,
        "state": ""
      },
      {
        "country": "",
        "numOccurrences": 860,
        "state": ""
      },
      {
        "country": "ca",
        "numOccurrences": 293,
        "state": ""
      },
      {
        "country": "gb",
        "numOccurrences": 69,
        "state": ""
      },
      {
        "country": "au",
        "numOccurrences": 46,
        "state": ""
      },
      {
        "country": "de",
        "numOccurrences": 9,
        "state": ""
      }
    ]
  }
}

Actual outcome:
An internal server error occurs.
The above mentioned query also works in Playground so it should not be a GraphQL syntax issue.