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Unhandled Exception: 'package:provider/src/provider.dart': Failed assertion: line 191 pos 7: 'context.owner.debugBuilding || listen == false || debugIsInInheritedProviderUpdate': Tried to listen to a value exposed with provider, from outside of the widget tree.

This is likely caused by an event handler (like a button's onPressed) that called
Provider.of without passing `listen: false`.

To fix, write:
Provider.of<UserBloc>(context, listen: false);

It is unsupported because may pointlessly rebuild the widget associated to the
event handler, when the widget tree doesn't care about the value.

authenticate(BuildContext context) async {
    var bloc = Provider.of<UserBloc>(context, listen: false);

    var user = await bloc.authenticate(
      new AuthenticateModel(
        username: username,
        password: password,
      ),
    );

    if (user != null) {
      Navigator.pop(context);
      return;
    }

    final snackBar = SnackBar(content: Text('Usuário ou senha invalidos'));
    _scaffoldKey.currentState.showSnackBar(snackBar);
  }

class AccountPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    var bloc = Provider.of<UserBloc>(context);

    return Scaffold(
      appBar: AppBar(
        actions: <Widget>[
          FlatButton(
            child: Icon(
              Icons.settings,
            ),
            onPressed: () {
              Navigator.push(
                context,
                MaterialPageRoute(
                  builder: (context) => SettingsPage(),
                ),
              );
            },
          )
        ],
      ),
      body: bloc.user == null
          ? UnauthenticatedUserCard()
          : AuthenticatedUserCard(),
    );
  }
}

FlatButton(
                child: Text("Entrar"),
                onPressed: () {
                  if (_formKey.currentState.validate()) {
                    _formKey.currentState.save();
                    authenticate(context);
                  }
                },
              ),

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MultiProvider(
      providers: [
        ChangeNotifierProvider<HomeBloc>.value(
          value: HomeBloc(),
        ),
        ChangeNotifierProvider<CartBloc>.value(
          value: CartBloc(),
        ),
        ChangeNotifierProvider<UserBloc>.value(
          value: UserBloc(),
        ),
        ChangeNotifierProvider<ThemeBloc>.value(
          value: ThemeBloc(),
        ),
      ],
      child: Main(),
    );
  }
}