Flutter provider length was called on null - flutter

Question

I have a list using flutter provider.But firestore data works.The problem is that provider. Error is the getter length was called on null. I searched this question in stackoverflow, i tried every answer but they did not solve my problem. Here is included code in bellow :
GameServices Class
class GamesServices {
String collection = 'games';
Firestore _firestore = Firestore.instance;
Future<List<GamesModel>> getGames() async {
_firestore.collection(collection).getDocuments().then((result) {
List<GamesModel> gameList = <GamesModel>[];
for (DocumentSnapshot game in result.documents) {
gameList.add(GamesModel.fromSnapshot(game));
}
return gameList;
});
}
Provider Class
class BoshphelmProvider with ChangeNotifier {
GamesServices _gamesServices = GamesServices();
List<GamesModel> _games = <GamesModel>[];
List<GamesModel> get games => _games;
BoshphelmProvider.initialize() {
loadGames();
}
loadGames() async {
_games = await _gamesServices.getGames();
notifyListeners();
}
}
Main Class
void main() {
setupLocator();
runApp(MyApp());
}
class MyApp extends StatefulWidget {
#override
_MyAppState createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
#override
Widget build(BuildContext context) {
return ChangeNotifierProvider.value(
value: BoshphelmProvider.initialize(),
child: MaterialApp(
debugShowCheckedModeBanner: false,
title: 'Boshphelm',
theme: ThemeData(
primaryColor: Constant.primaryColor,
visualDensity: VisualDensity.adaptivePlatformDensity,
),
home: HomePage(),
),
);
}
}

Answer 1

you are missing the code part where you try to get the length of something and it throws that error
without that i would guess you are trying to access games list before it finishes initializing, as you are not waiting for it
try this
void main() async {
WidgetsFlutterBinding.ensureInitialized();
BoshphelmProvider _provider = BoshphelmProvider();
await _provider.initialize()
setupLocator();
runApp(MyApp());
}
class MyApp extends StatefulWidget {
#override
_MyAppState createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
#override
Widget build(BuildContext context) {
return ChangeNotifierProvider.value(
value: _provider,
child: MaterialApp(
debugShowCheckedModeBanner: false,
title: 'Boshphelm',
theme: ThemeData(
primaryColor: Constant.primaryColor,
visualDensity: VisualDensity.adaptivePlatformDensity,
),
home: HomePage(),
),
);
}
}