我正在Flutter上构建一个应用程序，其中包括一个Firebase用户聊天功能。为了真实的显示数据更新，我通过StreamBuilder获取数据。一切正常，但当我决定关闭iPhone X上的WIFI和互联网连接时，我收到以下错误，应用程序关闭（注意在模拟器上没有出现任何错误，也没有关闭）：
构建流式构建器的代码：

chatList(){
    return StreamBuilder<QuerySnapshot>(
      stream: DatabaseService(uid: FirebaseAuth.instance.currentUser!.uid).getChatInfo(),
      builder: (context, snapshot){
        //make some checks
        if(snapshot.hasData){
          var docs = snapshot.data!.docs;
          if(docs.isNotEmpty){
            return ListView.separated(
              itemCount: docs.length,
              itemBuilder: (context, index) {
                var doc = docs[index];
                return ChatTile(
                  bondName: (doc['bondNames'][0] == userName)?  doc['bondNames'][1] : doc['bondNames'][0], 
                  chatId: doc['chatId'],
                  sender: checkSender(doc['sentById'].toString()),
                  lastMessage: doc['lastMessage'].toString(),
                  elapsedTime: calculateElapsedTime((doc['sentAt'] as Timestamp).toDate()),
                  read: doc['read'],
                  userId: userId ,
                );
              },
              separatorBuilder: (context, index) {
                return const Divider();
              },
            );
          }else{
            return noChatWidget();
          }
        }else{
          return Center(
            child: CircularProgressIndicator(
              color: Theme.of(context).primaryColor,
              )
            );
        }
      },
    );

  }

物理设备上的错误：

+88312 ms] 10.2.0 - [FirebaseFirestore][I-FST000001] WatchStream
(102d1d448) Stream error: 'Unavailable: Network connectivity changed'
[   +1 ms] 10.2.0 - [FirebaseFirestore][I-FST000001] WriteStream
(102d79128) Stream error: 'Unavailable: Network connectivity changed'
[+16360 ms] 10.2.0 - [FirebaseFirestore][I-FST000001] WatchStream
(102d1d448) Stream error: 'Unavailable: Network connectivity changed'
[   +8 ms] 10.2.0 - [FirebaseFirestore][I-FST000001] WatchStream
(102d1d448) Stream error: 'Unavailable: DNS resolution failed for
firestore.googleapis.com: UNKNOWN: nodename nor servname provided, or not
known'
[+4007 ms] 10.2.0 - [FirebaseFirestore][I-FST000001] WatchStream
(102d1d448) Stream error: 'Unavailable: DNS resolution failed for
firestore.googleapis.com: UNKNOWN: nodename nor servname provided, or not
known'
[  +11 ms] 10.2.0 - [FirebaseFirestore][I-FST000001] WatchStream
(102d1d448) Stream error: 'Unavailable: DNS resolution failed for
firestore.googleapis.com: UNKNOWN: nodename nor servname provided, or not
known'
[+1306 ms] Service protocol connection closed.
[        ] Lost connection to device.
[   +9 ms] DevFS: Deleting filesystem on the device
(file:///private/var/mobile/Containers/Data/Application/4D1F7639-FEF1-4A33
-866E-734CC70BE773/tmp/binderpC3ghF/binder/)
[ +253 ms] Ignored error while cleaning up DevFS: TimeoutException after
0:00:00.250000: Future not completed
[  +22 ms] "flutter run" took 1.660.540ms.
[  +31 ms] ensureAnalyticsSent: 13ms
[   +1 ms] Running shutdown hooks
[        ] Shutdown hooks complete
[   +1 ms] exiting with code 0

我试过检查互联网连接，并在流构建器上没有连接时返回null，但我仍然得到错误崩溃的应用程序。我已经搜索了所有地方，我仍然找不到为什么我得到错误知道Firebase甚至应该给予我一个离线选项，它只发生在物理设备上。谢谢！