Consumer of ChangeNotifierProvider is always null - flutter

Question

The Machinemodel instance from the Consumer is always null.
Why?
App
import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
// This widget is the root of your application.
#override
Widget build(BuildContext context) {
return MaterialApp(
debugShowCheckedModeBanner: false,
title: 'Provider nested model demo',
theme: ThemeData(
// This is the theme of your application.
primarySwatch: Colors.blue,
),
home: ApplicationPage());
}
}
ApplicationPage
class ApplicationPage extends StatelessWidget {
#override
Widget build(BuildContext context) {
var newMachineEntity = new MachineEntity(1, "Power x1000"); //, engines);
return Scaffold(
appBar: AppBar(title: Text("Machine demo"), elevation: 6),
body: ChangeNotifierProvider(create: (context) => new MachineModel(newMachineEntity), child: MachineWidget()));
}
}
Widget
class MachineWidget extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Consumer<MachineModel>(builder: (context, machine, child) {
////////////////////// machine instance is null /////////////
return Container(
child: Column(
children: <Widget>[
TextFormField(
initialValue: machine.name,
onChanged: (value) => machine.name = value,
),
],
),
);
});
}
}
Model
class MachineModel extends ChangeNotifier {
MachineEntity machineEntity;
// List<EngineModel> engines;
MachineModel(this.machineEntity) {
// engines = this.machineEntity.engines.map((eng) => new EngineModel(eng)).toList();
}
String get name => machineEntity.name;
set name(String value) {
machineEntity.name = value;
notifyListeners();
}
}
Entity
class MachineEntity {
int id;
String name;
// List<EngineEntity> engines;
MachineEntity(this.id, this.name); //, this.engines);
}