WebViewWidget issue iOS Could not cast value of type NSNull (0x1ec725448) to 'webview_flutter_wkwebview.AuthenticationChallengeResponse' (0x10591eef8)

Question

I'm encountering the following error when using the webview_flutter package in Flutter: Could not cast value of type NSNull (0x1ec725448) to <'webview_flutter_wkwebview.AuthenticationChallengeResponse'>(0x10591eef8)

import 'package:flutter/material.dart';
import 'package:webview_flutter/webview_flutter.dart';

class PaymentWebview extends StatefulWidget {
  final String initialUrl;

  const PaymentWebview({super.key, required this.initialUrl});

  @override
  State<PaymentWebview> createState() => _PaymentWebviewState();
}

class _PaymentWebviewState extends State<PaymentWebview> {
  late final WebViewController _controller;

  @override
  void initState() {
    super.initState();

    // Инициализация WebView
    try {
      late final PlatformWebViewControllerCreationParams params;

      if (WebViewPlatform.instance is WebKitWebViewPlatform) {
        params = WebKitWebViewControllerCreationParams(
          allowsInlineMediaPlayback: true,
          mediaTypesRequiringUserAction: const <PlaybackMediaTypes>{},
        );
      } else {
        params = const PlatformWebViewControllerCreationParams();
      }

      final WebViewController controller =
          WebViewController.fromPlatformCreationParams(params);

      controller
        ..setJavaScriptMode(JavaScriptMode.unrestricted)
        ..setNavigationDelegate(
          NavigationDelegate(
            onProgress: (int progress) {
              debugPrint('Загрузка: $progress%');
            },
            onPageStarted: (String url) {
              debugPrint('Страница начала загружаться: $url');
            },
            onPageFinished: (String url) {
              if (!mounted) return; // Проверяем, что экран не был закрыт

              if (url.contains("success")) {
                print("✅ Оплата успешна: $url");
                if (mounted) {
                  Navigator.pop(context, true);
                }
              } else if (url.contains("fail")) {
                print("❌ Ошибка оплаты: $url");
                if (mounted) Navigator.pop(context, false);
              }
            },
            onHttpError: (HttpResponseError error) {
              debugPrint('HttpResponseError: ${error.response}');
            },
            onWebResourceError: (WebResourceError error) {
              debugPrint('WebResourceError: ${error.description}');
            },
            onHttpAuthRequest: null,
            onNavigationRequest: (NavigationRequest request) {
              return NavigationDecision.navigate;
            },
          ),
        )
        ..loadRequest(Uri.parse(widget.initialUrl));

      _controller = controller;
    } catch (ex) {
      print('Error in webview: $ex');
    }
  }

  @override
  void dispose() {
    if (mounted) {
      _controller.clearCache();
    }
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text("Payment")),
      body: Stack(
        children: [
          WebViewWidget(controller: _controller),
        ],
      ),
    );
  }
}

Error: Could not cast value of type NSNull (0x1ec725448) to 'webview_flutter_wkwebview.AuthenticationChallengeResponse' (0x10591eef8)

Context:

1.This error occurs when loading the WebView. 2.The URL provided to loadRequest works fine in a browser, but the WebView throws this error when interacting with certain parts of the page. 3.I have implemented a NavigationDelegate to handle page loading, JavaScript, and error handling.

Answer 1

This is caused by a bug with recent update of webview_flutter_wkwebview (3.18.0), as discussed in this issue on Flutter repo.

You can temporarily fix it by overriding dependency version in pubspec.yaml back to 3.17.0:

dependency_overrides:
  webview_flutter_wkwebview: 3.17.0