crash when pressing `MicroService`

[LiorRabin]

Hi, I'm trying to run the example as is, and when pressing the MicroService button the app crashes. Attaching the flutter doctor output if needed.

[✓] Flutter (Channel stable, v1.12.13+hotfix.5, on Mac OS X 10.14.6 18G103, locale en-IL)
    • Flutter version 1.12.13+hotfix.5 at /Users/liorrabin/Dev/flutter
    • Framework revision 27321ebbad (2 weeks ago), 2019-12-10 18:15:01 -0800
    • Engine revision 2994f7e1e6
    • Dart version 2.7.0


[✓] Android toolchain - develop for Android devices (Android SDK version 29.0.2)
    • Android SDK at /Users/liorrabin/Library/Android/sdk
    • Android NDK location not configured (optional; useful for native profiling support)
    • Platform android-29, build-tools 29.0.2
    • Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b49-5587405)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 11.3)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 11.3, Build version 11C29
    • CocoaPods version 1.8.4

[✓] Android Studio (version 3.5)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin version 40.2.2
    • Dart plugin version 191.8593
    • Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b49-5587405)

[✓] VS Code (version 1.41.1)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.7.1

[✓] Connected device (1 available)
    • iPhone 11 Pro Max • 1C065D44-7D2B-4742-99AF-0A0DB989E84E • ios • com.apple.CoreSimulator.SimRuntime.iOS-13-3 (simulator)

• No issues found!

[LiorRabin]

This crash happens on iOS simulator, while on the Android simulator, the example works.

[j0j00]

I unfortunately don't have much free to time to work on the project at the moment.

If you're able to fix the issue, then feel free to put in a PR and I'll be sure to merge and publish it pending testing.