Flutter WebView Crashes on IOS Real Device but Works on IOS Emulator and Android

`I am developing a Flutter application that includes a payment flow using webview_flutter. The WebView is used to load an external payment page where users can complete their transactions.

The implementation works perfectly on Android devices and the iOS emulator. However, when I run the app on a real iOS device, the app crashes as soon as it navigates to the WebView screen.

How can I fix this crash on real iOS devices?`

Code:

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

class WebViewExample extends StatefulWidget {
  final String url;
  const WebViewExample({super.key, required this.url});

  @override
  State<WebViewExample> createState() => _WebViewExampleState();
}

class _WebViewExampleState extends State<WebViewExample> {
  late WebViewController _controller;
  bool isLoading = true;

  @override
  void initState() {
    super.initState();
    _controller = WebViewController()
      ..setJavaScriptMode(JavaScriptMode.unrestricted)
      ..setNavigationDelegate(
        NavigationDelegate(
          onPageStarted: (String url) {
            setState(() {
              isLoading = true;
            });
          },
          onPageFinished: (String url) {
            setState(() {
              isLoading = false;
            });
          },
        ),
      )
      ..loadRequest(Uri.parse(widget.url));
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Stack(
        children: [
          WebViewWidget(controller: _controller),
          if (isLoading)
            const Center(child: CircularProgressIndicator()),
        ],
      ),
      bottomNavigationBar: BottomAppBar(
        child: Row(
          children: [
            Expanded(
              child: ElevatedButton(
                onPressed: () => Navigator.pop(context),
                child: const Text('Exit Payment Page'),
              ),
            ),
          ],
        ),
      ),
    );
  }
}