Flutter 错误：Class'；QuerySnapshot'；没有实例getter'；数据'；

我正在尝试创建一个包含3个选项卡的UI屏幕。最近项目、回顾项目和简介。然而，在recentitem小部件中存在一些后端问题。显示错误：类“QuerySnapshot”没有实例获取程序“data”。 Ps：整个代码相当大，因此我为整个代码共享了一个文档： RecentItems（）：

Widget RecentItems（）{
返回填充(
填充：常数边集全部（10.0），
孩子：StreamBuilder(
流：Firestore.instance
.收集（“用户”）
.文件（uid）
.收藏（“近期”）
.snapshots（），
生成器：（上下文，快照）{
打印（快照数据）；
List orders=List.from（Map.from（snapshot.data.data）['orders']）；
地图顺序；
对于（int i=0；i

错误消息是：

The getter 'data' was called on null.
Receiver: null
Tried calling: data
The relevant error-causing widget was: 
  StreamBuilder<QuerySnapshot> file:///C:/Flutter/Naniz_eats/lib/UserProfilePage.dart:434:14
════════════════════════════════════════════════════════════════════════════════════════════════════
I/flutter (28940): Instance of 'QuerySnapshot'

════════ (3) Exception caught by widgets library ═══════════════════════════════════════════════════
Class 'QuerySnapshot' has no instance getter 'data'.
Receiver: Instance of 'QuerySnapshot'
Tried calling: data
The relevant error-causing widget was: 
  StreamBuilder<QuerySnapshot> file:///C:/Flutter/Naniz_eats/lib/UserProfilePage.dart:434:14

对null调用了getter“data”。
收件人：空
尝试呼叫：数据
导致错误的相关小部件是：
StreamBuilderfile:///C:/Flutter/Naniz_eats/lib/UserProfilePage.dart:434:14
════════════════════════════════════════════════════════════════════════════════════════════════════
I/flatter（28940）：“QuerySnapshot”的实例
════════ （3） widgets库捕获到异常═══════════════════════════════════════════════════
“QuerySnapshot”类没有指令
The getter 'data' was called on null.
Receiver: null
Tried calling: data
The relevant error-causing widget was: 
  StreamBuilder<QuerySnapshot> file:///C:/Flutter/Naniz_eats/lib/UserProfilePage.dart:434:14
════════════════════════════════════════════════════════════════════════════════════════════════════
I/flutter (28940): Instance of 'QuerySnapshot'

════════ (3) Exception caught by widgets library ═══════════════════════════════════════════════════
Class 'QuerySnapshot' has no instance getter 'data'.
Receiver: Instance of 'QuerySnapshot'
Tried calling: data
The relevant error-causing widget was: 
  StreamBuilder<QuerySnapshot> file:///C:/Flutter/Naniz_eats/lib/UserProfilePage.dart:434:14

Firestore.instance
              .collection("users")
              .document(uid)
              .collection("recent")
              .snapshots()

            List orders = List.from(Map.from(snapshot.data.data)['orders']);

List<DocumentSnapshot> orders = snapshot.data.documents;