[SOLVED] Flutter : NoSuchMethodError: The getter ‘isEmpty’ was called on null.

Problem

When I call an API, the response comes back as Variable Data ($data). When data arrives, there is no error; but, when I receive null as a response, I receive the error Unhandled. Exception: The getter ‘isEmpty’ was called on null, resulting in a NoSuchMethodError.

The code below is giving me an error when I use it:

Solution

Due to the fact that $data returns null, I’ve used

If (data?.isEmpty?? true), then

? avoids an error if the expression’s first component is null, and?? Since isEmpty and == null are treated equally for the purposes of the if(…) check, true results in true if the previous component of the expression is null.

My code is now correctly running.