Flutter objectbox initialization

Question

How can i initialize properly the instance of my DatabaseProvider? I'm struggling with it. I found solutions but everyone of them initialize objectbox in the widgets, but i would use Bloc pattern in my application and would use objectbox in my repositories.

Here is the DatabaseProvider:

import 'package:testroject/data/models/user.dart';
import 'package:testproject/objectbox.g.dart';
import 'package:objectbox/objectbox.dart';

import '../../util/logging.dart';

class DatabaseProvider {
  late Store? store;

  DatabaseProvider() {
    create();
  }

  DatabaseProvider._create(this.store) {}

  static Future<DatabaseProvider> create() async {
    final store = await openStore();
    return DatabaseProvider._create(store);
  }

  Future<void> updateUser(User user) async {
    store?.box<User>().put(user);
  }

  User? getUser() {
    User? user;
    try {
      user = store?.box<User>().getAll().first;
    } catch (e) {
      logger.i(e);
    }
    return user;
  }
}

The Store is always null.

I would use this DatabaseProvider in the repositories like:

class UserRepository implements IUserRepository {
  final database = ServiceLocator.getIt<DatabaseProvider>();

Provide the instance of the DatabaseProvider in the main.dart

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await Firebase.initializeApp();
  ApplicationInitialization().initializeRepositories();
  ServiceLocator.getIt.registerSingleton<DatabaseProvider>(DatabaseProvider());
  runApp(AppMain(appRouter: ApplicationRouter()));
}

So i would inject in the repositories. Is there anyone who can help me with this? Thank all of you!