I basically have a normal WebView controller setup in flutter to access a website. When I use that websites sign in button i get 2 errors.

I/chromium( 7803): [INFO:CONSOLE(192)] “Uncaught Error: no window opener”,
I/chromium( 7803): [INFO:CONSOLE(1)] “Uncaught TypeError: Cannot read properties of null (reading ‘postMessage’)”,

I assume the actual window is being lost somewhere and then the website can’t find it.

This is my current webview code

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


class WebViewContainer extends StatefulWidget {
  const WebViewContainer({super.key});

  @override
  State<WebViewContainer> createState() => _WebViewContainerState();
}

class _WebViewContainerState extends State<WebViewContainer> {

  final controller = WebViewController()
  ..setJavaScriptMode(JavaScriptMode.unrestricted)
  ..setNavigationDelegate(NavigationDelegate(
      onNavigationRequest: (NavigationRequest request){
        return NavigationDecision.navigate;
      }
  ))
  ..loadRequest(Uri.parse('TheWebsite'));



  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("")
      ),
      body: WebViewWidget(controller: controller),
    );
  }
}