How to Resolve Getter ‘Value’ Was Called On Null In Flutter ?

When building a mobile application some times a user may forget to define a particular controller. And the compiler will go through an error that states about the getter value was called on null. So in today’s article, we will go through How to Resolve Getter ‘Value’ Was Called On Null In Flutter?

How to Resolve Getter Value Was Called On Null in Flutter?

The error “Getter Value Was Called On Null” in Flutter occurs when you try to access a property (getter) on a variable that is currently null. Here are some ways to resolve this:

1. Check for null before accessing the property:

This is the most common and recommended approach. Use a null-conditional operator (?.) to check if the variable is not null before accessing its property. This operator returns null if the variable is null, otherwise, it evaluates the expression and returns the result.
Here’s an example:

String? name; // Variable might be null


// Incorrect: Throws error if name is null
String greeting1 = "Hello, $name";


// Correct: Checks for null before accessing the property
String greeting2 = "Hello, ${name?.toUpperCase()}";


void main(List args) {
  name = 'john';
  print(greeting1); // Output: Hello, JOHN DOE!
  print(greeting2); // Output: Hello, JOHN DOE!
}

2. Initialize the variable with a default value:

If you know the variable should always have a value, initialize it with a default value, even if it’s an empty string or null depending on your use case. This ensures the variable is never null when you try to access its property.
Here’s an example:

String name = ""; // Default empty string

String greeting = "Hello, $name!";

3. Use optional chaining (Dart 2.3+):

If you’re using Dart 2.3 or later, you can utilize optional chaining (?.) to achieve a cleaner syntax. This operator allows you to chain multiple property accesses and returns null if any of the properties in the chain evaluate to null.
Here’s an example:

class User {
  String? name;
  String? city;
}


User? user; // Variable might be null


String greeting = user?.name?.toUpperCase() ?? "No user";

4. Refactor your code to avoid null checks:

In some cases, you might be able to refactor your code to avoid null checks altogether. This can involve using null-safe operators like the null-assertion operator (!) (use with caution) or restructuring your code logic to handle potential null values gracefully.

Sometimes, using hot reload in development mode might not trigger the initialization of variables in your initState method. If the error persists even after making the above corrections, try restarting the app instead of hot restarting.
Remember, best practices in Flutter advocate for utilizing null-safety to its full potential to prevent such errors and ensure robust code. Choose the solution that best suits your specific situation and coding style.

Conclusion:

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Written by Abhishek Dhanani

Abhishek Dhanani, a skilled software developer with 3+ years of experience, masters Dart, JavaScript, TypeScript, and frameworks like Flutter and NodeJS. Proficient in MySQL, Firebase, and cloud platforms AWS and GCP, he delivers innovative digital solutions.