Error

{
  "graphQLErrors": [
    {
      "message": "GraphQL.ExecutionError: Cannot return null for non-null type. Field: city, Type: CityInterface!.\r\n   at GraphQL.Execution.ExecutionStrategy.ValidateNodeResult(ExecutionContext context, ExecutionNode node)\r\n   at GraphQL.Execution.ExecutionStrategy.<ExecuteNodeAsync>d__7.MoveNext()",
      "locations": [
        {
          "line": 218,
          "column": 5
        }
      ],
      "path": [
        "plan",
        "similarHomes",
        "0",
        "community",
        "city"
      ]
    }
  ],
  "clientErrors": [],
  "networkError": null,
  "message": "GraphQL.ExecutionError: Cannot return null for non-null type. Field: city, Type: CityInterface!.\r\n   at GraphQL.Execution.ExecutionStrategy.ValidateNodeResult(ExecutionContext context, ExecutionNode node)\r\n   at GraphQL.Execution.ExecutionStrategy.<ExecuteNodeAsync>d__7.MoveNext()"
}