Null check operator used on a null value in flutter project

Question

In the drawer, I'm showing the user's email address. but null error is showing ! i am also adding ? this sign same error but null

final email = FirebaseAuth.instance.currentUser!.email;


   Center(
      child: Text(
        '$email',
        style: const TextStyle(fontWeight:   FontWeight.bold, fontSize: 18.0, color: Colors.indigo),
      ),
    ),

! is used when you are sure its not null. You have to either check the value is null or not before using the ! operator or use ? operator — krishna_ananth_vk
– krishna_ananth_vk, Commented Jan 2, 2023 at 10:29

Md. Yeasin Sheikh · Accepted Answer · 2023-01-02 10:20:17Z

1

It is possible your currentUser is null. Instead of forcing with bang!, you can do a null check or accept null value like

final email = FirebaseAuth.instance.currentUser?.email;

Also you can provide default value like

final email = FirebaseAuth.instance.currentUser?.email ?? "Got null user";

Find more about null-safety

answered Jan 2, 2023 at 10:20

Md. Yeasin Sheikh

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2 Comments

bino arin Over a year ago

Null text is displayed in place of the email id.

Snehal Singh Over a year ago

that's indicates the instance of firebaseAuth is not able to fetch the data of currentUser

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