Remove bug `Method 'map' cannot be called on 'List<XFile>?' because it is potentially null`

In Dart 2.18.0 I found this bug in the app build time.

Bug:

/C:/flutter/.pub-cache/hosted/pub.dartlang.org/image_editor_plus-0.1.8/lib/image_editor_plus.dart:165:42: Error: Method 'map' cannot be called on 'List<XFile>?' because it is potentially null.
 - 'List' is from 'dart:core'.
- 'XFile' is from 'package:cross_file/src/types/io.dart' ('/C:/flutter/.pub-cache/hosted/pub.dartlang.org/cross_file-0.3.3+1/lib/src/types/io.dart').
package:cross_file/…/types/io.dart:1
Try calling using ?. instead.
                  images.addAll(selected.map((e) => ImageItem(e)).toList());
                                         ^^^
3

FAILURE: Build failed with an exception.

* Where:
Script 'C:\flutter\packages\flutter_tools\gradle\flutter.gradle' line: 1159

* What went wrong:
Execution failed for task ':app:compileFlutterBuildSprodDebug'.
> Process 'command 'C:\flutter\bin\flutter.bat'' finished with non-zero exit value 1

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 43s
Exception: Gradle task assembleSprodDebug failed with exit code 1

hsbijarniya / image_editor_plus

Remove bug `Method 'map' cannot be called on 'List<XFile>?' because it is potentially null` #30