Null Safety issue on the given example!

[kishan-dhankecha]

Page URL

https://docs.flutter.dev/cookbook/effects/shimmer-loading/

Page source

https://github.com/flutter/website/tree/main/src/content/cookbook/effects/shimmer-loading.md

Describe the problem

There is an issue with the code provided in the example below. When I copied the whole code from the interactive editor in the website and pasted it into my project to use the ShimmerLoading widget, I found that I get the classic Null check operator used on a null value error. See the issue in the below snippet.

// Collect ancestor shimmer information.
final shimmer = Shimmer.of(context)!; /// Error comes from this line
if (!shimmer.isSized) {
  // The ancestor Shimmer widget isn't laid
  // out yet. Return an empty box.
  return const SizedBox();
}

Expected fix

It should be changed to this,

// Collect ancestor shimmer info.
final shimmer = Shimmer.of(context);
if (shimmer == null || !shimmer.isSized) {
  // The ancestor Shimmer widget has not laid
  // itself out yet. Return an empty box.
  return const SizedBox();
}

Additional context

No response

I would like to fix this problem.

• I will try and fix this problem on docs.flutter.dev.