Null is not a subtype of type String - flutter

Question

Hello I’m new to flutter
I’m trying to retrieve the user data from his email but i got this error [Null is not a subtype of type String]
The data I’m trying to retrieve is not null
This is my code
class _ProfilePageState extends State<ProfilePage> {
late User user;
final _auth = FirebaseAuth.instance;
late User signedInUser;
var id;
var email;
var name;
var age;
var sex;
#override
void initState() {
super.initState();
onRefresh(FirebaseAuth.instance.currentUser);
getCurrentUser();
}
onRefresh(userCare)
{
setState(()
{
user = userCare;
});
}
void getCurrentUser()
{
try {
final user = _auth.currentUser;
if (user != null) {
signedInUser = user;
email = signedInUser.email;
id = signedInUser.uid;
}
} catch (e) {
print(e);
}
}
void getData() {
FirebaseFirestore.instance
.collection('users')
.get()
.then((QuerySnapshot querySnapshot) {
querySnapshot.docs.forEach((doc) {
if (doc["email"] == signedInUser.email) {
name = doc['name'];
age = doc['age'];
sex = doc['sex'];
print(doc['name']);
}
});
});
}
This is my data
I want to retrieve then but i can’t because it says null how to fix the error?
this is the data I’m trying to retrieve
the error image

Answer 1

Please try this Code:
void getData() async {
await FirebaseFirestore.instance
.collection('users')
.get()
.then((value) {
for(var doc in value.docs) {
if (doc["email"] == signedInUser.email) {
name = doc.data()['name'];
age = doc.data()['age'];
sex = doc.data()['sex'];
print(doc.data()['name']);
}
}
});
}