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Handling Null API Responses in Flutter: Preventing ‘NoSuchMethodError

The error message “NoSuchMethodError: The getter ‘isEmpty’ was called on null” typically occurs when you try to call the isEmpty method on a variable that is null. In your case, it seems that you are trying to use the isEmpty method on a variable that contains the response from an API, and when the API response is null, you encounter this error.

To handle this situation gracefully and avoid the error, you should check whether the variable is null before calling the isEmpty method. Here’s an example of how you can do this in Dart:

if (data != null && data.isEmpty) {
  // Handle the case when the data is an empty string
} else if (data == null) {
  // Handle the case when the data is null
} else {
  // Handle the case when the data is not null and not empty
}

We first check if data is not null and then use the isEmpty method to check if it’s an empty string.

If data is null, we handle that specific case.

If data is neither null nor empty, we handle the normal case where the data is valid.

By adding these checks, you can prevent the “NoSuchMethodError” from occurring when the API response is null.

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