Unhandled Exception: type '_InternalLinkedHashMap<String, dynamic>' is not a subtype of type 'Iterable<dynamic>'

[D-e-v-N-i-n-j-a]

 
Future loadSalesData() async {
  String jsonString = await getJsonFromFirebaseRestAPI();
  final jsonResponse = json.decode(jsonString);
  setState(() {
    for (Map<String, dynamic> i in jsonResponse)
      chartData.add(SalesData.fromJson(i));
  });
}