LateInitializationError: Field '_userData@32329253' has not been initialized

Question

Getting this when trying to initialize data.

The following LateError was thrown building UserProfile(dirty, state: _UserProfileState#752a9): LateInitializationError: Field '_userData@32329253' has not been initialized."

Here's the code:

    late final User _user;
    late final DocumentSnapshot _userData;
    
      @override
      void initState() {  
        super.initState();
        _initUser();
      }
    
      void _initUser() async {
        _user = FirebaseAuth.instance.currentUser!;
        try {
          _userData = await FirebaseFirestore.instance
              .collection('users')
              .doc(_user.uid)
              .get();
        } catch (e) {
          print("something went wrong");
        }
      }

The build function is not even running as i tried to print _user and _userData to check if they have been initialized.
If i try to print _user and _userData in initUser() function, _user gets printed and _userData gets printed after the error statements.
Please help me find a way out through this error.

Have you checked your logs?! Firebase always tells you the error. Don't use try catch. — Mariano Zorrilla, Mar 21 '21 at 15:18
BTW you're using a lateinit on the wrong scope. Remove your lateinit keyword for _userData — Mariano Zorrilla, Mar 21 '21 at 15:19
first i was not using try catch still got the same error and removing late keyword does not compile as it's obvious that final variables needs to be initialized — Satyam Pandey, Mar 21 '21 at 15:27
you need to use optionals if you're not going to use a lateinit — Mariano Zorrilla, Mar 21 '21 at 16:50
you're trying to use a "final" variable from a future method on a override method that is not happening over the object construction. Lateinit exists for specific cases but it doesn't work for the logic you're trying to use. — Mariano Zorrilla, Mar 21 '21 at 16:53

score 20 · Answer 1 · answered Apr 10 '21 at 05:33

20

In my case, I faced this error while using easy_localization. I forgot:

  await EasyLocalization.ensureInitialized();

on main.dart file.

P.S. I know this is not the answer to this question, I wrote this for someone who faced this issue like my case.

answered Apr 10 '21 at 05:33

K.Amanov

1,278
14
23

score 15 · Accepted Answer · answered Mar 21 '21 at 15:59

15

Even though you are initializing these variables inside the initUser(), but you will get this error if you are using the variables inside the build() method since initUser() is asynchronous meaning it will take time to get the data from the collection. To solve this you can do:

@override
      void initState() {  
        super.initState();
        _initUser().whenComplete((){
          setState(() {});
       });
      }

This will rebuild the widget tree with the new values.

answered Mar 21 '21 at 15:59

Peter Haddad

78,874
25
140
134

Can this be used with the snippet in the OP? Because I get an error saying 'This expression has a type of 'void' so its value can't be used'. – Syed Saad Oct 08 '21 at 10:18

score -12 · Answer 3 · answered Jun 11 '21 at 07:29

-12

I have resolved this by simply running below command:

dart migrate --skip-import-check--ignore-exceptions

answered Jun 11 '21 at 07:29

Himanshu

861
10
25

1

Skipping errors is different from resolving them – Isac Moura Jun 21 '22 at 12:03

LateInitializationError: Field '_userData@32329253' has not been initialized

3 Answers3

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