fetchRingGroup graphQL query returns invalid data

When calling fetchRingGroup with a group Number which doesn't exist, invalid data will be returned (seemingly the first ringgroup in the system).

Steps to reproduce
1. Select a ringgroup number which doesn't exist in the system
2. Do a grapql search:

query select{
  fetchRingGroup (groupNumber: 2001) {
      id
      groupNumber
      groupList
      description
  }
}

Expected results:
No data returned

Actual results:
A different ringgroup is returned to the one requested, seemingly the first one in the ssytem