What does null check operator used on a null value mean in flutter

Question

Here I am getting this error in _formKey.currentState.;save();this code please help me to resolve

I am new to flutter and I dont have an idea about this

Answer 1

Your code _formKey.currentState! is telling the system _formKey.currentState is not null but when it is called, _formKey.currentState is null. That's why you got the error.

Make you have declared _formKey in your class and assigned it to a Form widget before you call _formKey.currentState!

import 'package:flutter/material.dart';

class MyCustomForm extends StatefulWidget {
  const MyCustomForm({super.key});

  @override
  MyCustomFormState createState() {
    return MyCustomFormState();
  }
}

class MyCustomFormState extends State<MyCustomForm> {
  final _formKey = GlobalKey<FormState>(); // Declare _formKey

  @override
  Widget build(BuildContext context) {
    return Form(
      key: _formKey, // Assign to Form widget
      child: Column(
        children: <Widget>[
          Text('your other widget'),
        ],
      ),
    );
  }
}