Get default dialog null on flutter 3

[yogithesymbian]

[VERBOSE-2:ui_dart_state.cc(198)] Unhandled Exception: Null check operator used on a null value
#0      ExtensionDialog.dialog
package:get/…/src/extension_navigation.dart:81
#1      ExtensionDialog.defaultDialog
package:get/…/src/extension_navigation.dart:262
#2      _UserPageState.build.<anonymous closure>.<anonymous closure>
package:flutter_indonesia_2021/…/user/user_page.dart:31
#3      _UserPageState.build.<anonymous closure>.<anonymous closure>
package:flutter_indonesia_2021/…/user/user_page.dart:22
#4      _InkResponseState._handleTap
package:flutter/…/material/ink_well.dart:1005
#5      GestureRecognizer.invokeCallback
package:flutter/…/gestures/recognizer.dart:198
#6      TapGestureRecognizer.handleTapUp
package:flutter/…/gestures/tap.dart:613
#7      BaseTapGestureRecognizer._checkUp
package:flutter/…/gestures/tap.dart:298
#8      BaseTapGestureRecognizer.handlePrimaryPointer (package:flutter/src/g<…>

my code

floatingActionButton: FloatingActionButton(
            onPressed: () async {
              Get.defaultDialog(
                title: "Welcome to Flutter Dev'S",
              );
            },
            child: Text('Add'),
          ),

get: ^4.6.1

flutter doctor -v

[✓] Flutter (Channel stable, 3.0.5, on macOS 12.4 21F79 darwin-arm, locale en-ID) • Flutter version 3.0.5 at /Users/yogiarifwidodo/dev/flutter • Upstream repository https://github.com/flutter/flutter.git • Framework revision f1875d570e (5 weeks ago), 2022-07-13 11:24:16 -0700 • Engine revision e85ea0e79c • Dart version 2.17.6 • DevTools version 2.12.2

[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.3) • Android SDK at /Users/yogiarifwidodo/Library/Android/sdk • Platform android-32, build-tools 30.0.3 • ANDROID_HOME = /Users/yogiarifwidodo/Library/Android/sdk • Java binary at: /Applications/Android Studio.app/Contents/jre/Contents/Home/bin/java • Java version OpenJDK Runtime Environment (build 11.0.12+0-b1504.28-7817840) • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 13.3) • Xcode at /Applications/Xcode.app/Contents/Developer • CocoaPods version 1.11.0

[✓] Chrome - develop for the web • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 2021.2) • Android Studio at /Applications/Android Studio.app/Contents • Flutter plugin can be installed from: 🔨 https://plugins.jetbrains.com/plugin/9212-flutter • Dart plugin can be installed from: 🔨 https://plugins.jetbrains.com/plugin/6351-dart • Java version OpenJDK Runtime Environment (build 11.0.12+0-b1504.28-7817840)

[✓] VS Code (version 1.71.0-insider) • VS Code at /Applications/Visual Studio Code - Insiders.app/Contents • Flutter extension version 3.46.0

[✓] Connected device (3 available) • iPhone 13 Pro Max (mobile) • 1E5AA71E-4BAC-4B5B-93F7-2C9D3E7A97BC • ios • com.apple.CoreSimulator.SimRuntime.iOS-15-4 (simulator) • macOS (desktop) • macos • darwin-arm64 • macOS 12.4 21F79 darwin-arm • Chrome (web) • chrome • web-javascript • Google Chrome 104.0.5112.79

[✓] HTTP Host Availability • All required HTTP hosts are available

• No issues found!