Exception caught by widgets library - Bad state - flutter

Question

import 'package:flutter/material.dart';
import 'package:firebase_auth/firebase_auth.dart';
import 'package:cloud_firestore/cloud_firestore.dart';
class ChatScreen extends StatefulWidget {
static const String screenRoute = 'chat_screen';
const ChatScreen({Key? key}) : super(key: key);
#override
State<ChatScreen> createState() => _ChatScreenState();
}
class _ChatScreenState extends State<ChatScreen> {
final _firestore = FirebaseFirestore.instance;
final _auth = FirebaseAuth.instance;
late User signedInUser;
String? messageText;
#override
void initState() {
super.initState();
getCurrentUser();
}
void getCurrentUser() {
try {
final user = _auth.currentUser;
if (user != null) {
signedInUser = user;
print(signedInUser.email);
}
} catch (e) {
print(e);
}
}
//void getMessages() async {
// final messages = await _firestore.collection('messages').get();
//for (var message in messages.docs) {
// print(message.data());
// }
//}
void messagesStream() async {
await for (var snapshot in _firestore.collection('messages').snapshots()) {
for (var message in snapshot.docs) {
print(message.data());
}
}
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
backgroundColor: Colors.yellow[900],
title: Row(
children: [
Image.asset('assets/images/logo.png', height: 25),
const SizedBox(width: 10),
const Text('ChatMe'),
],
),
actions: [
IconButton(
onPressed: () {
messagesStream();
//_auth.signOut();
//Navigator.pop(context);
},
icon: const Icon(Icons.download),
),
],
),
body: SafeArea(
child: Column(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
crossAxisAlignment: CrossAxisAlignment.stretch,
children: [
StreamBuilder<QuerySnapshot>(
stream: _firestore.collection('messages').snapshots(),
builder: (context, snapshot) {
List<Text> messageWidgets = [];
if (!snapshot.hasData) {
return const Center(
child: CircularProgressIndicator(
backgroundColor: Colors.blue,
),
);
}
final messages = snapshot.data!.docs;
for (var message in messages) {
final messageText = message.get('text');
final messageSender = message.get('sender');
final messageWidget = Text('$messageText - $messageSender');
messageWidgets.add(messageWidget);
}
return ListView(
children: messageWidgets,
);
},
),
Container(
decoration: const BoxDecoration(
border: Border(
top: BorderSide(
color: Colors.orange,
width: 2,
),
),
),
child: Row(
crossAxisAlignment: CrossAxisAlignment.center,
children: [
Expanded(
child: TextField(
onChanged: (value) {
messageText = value;
},
decoration: const InputDecoration(
contentPadding: EdgeInsets.symmetric(
vertical: 10,
horizontal: 20,
),
hintText: 'Write Your Message Here..',
border: InputBorder.none,
),
),
),
TextButton(
onPressed: () {
_firestore.collection('messages').add({
'text': messageText,
'sender': signedInUser.email,
});
},
child: Text(
'send',
style: TextStyle(
color: Colors.blue[800],
fontWeight: FontWeight.bold,
fontSize: 18,
),
),
),
],
),
),
],
),
),
);
}
}
════════ Exception caught by widgets library ═══════════════════════════════════
Bad state: field does not exist within the DocumentSnapshotPlatform
The relevant error-causing widget was
StreamBuilder<QuerySnapshot<Object?>>
lib\…\screens\chat_screen.dart:82
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