Flutter Null checkの対応がわからない

前提・実現したいこと

APIを受け取ったデータを画面上に表示させる処理を実装中に以下のエラーメッセージが発生しました。

発生している問題・エラーメッセージ

The following _CastError was thrown building Consumer<Status>(dirty, dependencies: [_InheritedProviderScope<Status?>]):
Null check operator used on a null value

The relevant error-causing widget was: 
  Consumer<Status> Consumer:file:///Users/username/StudioProjects/app_name/lib/screens/user_status.dart:55:14

該当のソースコード

APIを叩く処理(services/user_status.dart)

dart
1import 'package:flutter/material.dart';
2import 'package:delivery_kun/models/user_status.dart';
3import 'package:dio/dio.dart' as Dio;
4import 'package:intl/intl.dart';
5import 'dio.dart';
6
7class Status extends ChangeNotifier {
8  UserStatus? _userStatus;
9
10  UserStatus get status => _userStatus!;
11
12  String getDate() {
13    return DateFormat('yyyyMMdd').format(DateTime.now()).toString();
14  }
15
16
17  void getStatus(int user_id) async {
18    String date = getDate();
19
20    Dio.Response response = await dio()
21        .get('/status', queryParameters: {'date': date, 'user_id': user_id});
22    _userStatus = UserStatus.fromJson(response.data);
23
24    notifyListeners();
25  }
26}

モデル(models/user.dart)

dart
1class UserStatus {
2  final String onlineTime;
3  final int daysEarningsTotal;
4  final int daysEarningsQty;
5  final String vehicleModel;
6  final int actualCost;
7
8  UserStatus(
9      {required this.onlineTime,
10      required this.daysEarningsTotal,
11      required this.daysEarningsQty,
12      required this.actualCost,
13      required this.vehicleModel});
14
15  UserStatus.fromJson(Map<String, dynamic> json)
16      : onlineTime = json['data']['summary']['onlineTime'],
17        daysEarningsTotal = json['data']['summary']['daysEarningsTotal'],
18        actualCost = json['data']['summary']['actualCost'],
19        daysEarningsQty = json['data']['summary']['daysEarningsQty'],
20        vehicleModel = json['data']['user']['vehicleModel'];
21}
22

screenは長いため該当箇所のみです
getterの得たstatus.statusにアクセスするとエラーが起きるようです。

dart
1class LoggedInUserStatus extends StatelessWidget {
2  LoggedInUserStatus({required this.user_id});
3
4  int user_id;
5
6  @override
7  Widget build(BuildContext context) {
8    context.read<Status>().getStatus(user_id);
9    return Container(
10      child: Consumer<Status>(
11        builder: (context, status, child) => Column(
12          children: <Widget>[
13            Container(
14                alignment: Alignment.center,
15                padding: EdgeInsets.only(top: 20),
16                child: Text(
17                  DateFormat('yyyy年M月d日').format(DateTime.now()),
18                  textAlign: TextAlign.center,
19                  style: TextStyle(fontSize: 25, fontWeight: FontWeight.bold),
20                )),
21            Container(
22              height: 250,
23              color: Colors.grey,
24            ),
25            Container(
26                margin: EdgeInsets.only(right: 15, left: 15),
27                child: Column(
28                  children: [
29                    Container(
30                        alignment: Alignment.topLeft,
31                        margin: EdgeInsets.only(top: 10),
32                        child: Text(
33                          'ステータス',
34                          style: TextStyle(
35                            fontSize: 25,
36                          ),
37                        )),
38                    Table(
39                        border: TableBorder(
40                          bottom:
41                              BorderSide(width: 0.5, color: Color(0xFF000000)),
42                        ),
43                        children: [
44                          TableRow(children: [
45                            Text(
46                              '時間',
47                              style: TextStyle(color: Colors.grey),
48                            ),
49                            Text('数', style: TextStyle(color: Colors.grey))
50                          ]),
51                          TableRow(children: [
52                            TableCell(
53                              child: SizedBox(
54                                height: 50,
55                                child: Text(
56                                  status.status.onlineTime,
57                                  style: TextStyle(
58                                    fontSize: 20,
59                                  ),
60                                ),
61                              ),
62                            ),
63                            TableCell(
64                              child: SizedBox(
65                                height: 50,
66                                child: Text(
67                                  status.status.daysEarningsQty.toString(),
68                                  style: TextStyle(
69                                    fontSize: 20,
70                                  ),
71                                ),
72                              ),
73                            ),
74                          ]),
75                        ]),
76                    Container(
77                        alignment: Alignment.topLeft,
78                        margin: EdgeInsets.only(top: 10),
79                        child: Text(
80                          '明細',
81                          style: TextStyle(
82                            fontSize: 30,
83                          ),
84                        )),
85                    Table(children: [
86                      TableRow(children: [
87                        Text(
88                          '売上',
89                          style: TextStyle(
90                            color: Colors.black,
91                            fontSize: 20,
92                          ),
93                        ),
94                        Text(status.status.daysEarningsTotal.toString(),
95                            textAlign: TextAlign.right,
96                            style: TextStyle(
97                              color: Colors.black,
98                              fontSize: 20,
99                            ))
100                      ]),
101                      TableRow(children: [
102                        TableCell(
103                          child: SizedBox(
104                            height: 50,
105                            child: Text(
106                              '支出',
107                              style: TextStyle(
108                                fontSize: 20,
109                              ),
110                            ),
111                          ),
112                        ),
113                        TableCell(
114                          child: SizedBox(
115                            height: 50,
116                            child: Text(
117                              status.status.actualCost.toString(),
118                              textAlign: TextAlign.right,
119                              style: TextStyle(
120                                fontSize: 20,
121                              ),
122                            ),
123                          ),
124                        ),
125                      ]),
126                      TableRow(children: [
127                        TableCell(
128                          child: SizedBox(
129                            height: 50,
130                            child: Text(
131                              '利益',
132                              style: TextStyle(
133                                fontSize: 20,
134                              ),
135                            ),
136                          ),
137                        ),
138                        TableCell(
139                          child: SizedBox(
140                            height: 50,
141                            child: Text(
142                              (status.status.daysEarningsTotal -
143                                      status.status.actualCost)
144                                  .toString(),
145                              textAlign: TextAlign.right,
146                              style: TextStyle(
147                                fontSize: 20,
148                              ),
149                            ),
150                          ),
151                        ),
152                      ]),
153                    ]),
154                    ElevatedButton(
155                      onPressed: () {},
156                      child: Text( 'ボタン'),
157                      style: ElevatedButton.styleFrom(
158                        primary: Colors.grey,
159                        minimumSize: Size(double.infinity, 55),
160                      ),
161                    ),
162                  ],
163                ))
164          ],
165        ),
166      ),
167    );
168  }
169}