iOS app CRASH when using `windowId` in `InAppWebView`

### Is there an existing issue for this?

- [x] I have searched the existing issues

### Current Behavior

@pichillilorenzo 
@AlexV525 
@crazecoder 
@cbodin 

We are receiving this error in the iOS simulator reports, when trying to push a page with an `InAppWebView` on top of another page with `InAppWebView` by passing the `windowId` from `onCreateWindow` callback:
```
Exception Type:  EXC_BAD_ACCESS (SIGSEGV)
Exception Subtype: KERN_INVALID_ADDRESS at 0x0000000000000000
Exception Codes: 0x0000000000000001, 0x0000000000000000
VM Region Info: 0 is not in any region.  Bytes before following region: 4370350080
      REGION TYPE                    START - END         [ VSIZE] PRT/MAX SHRMOD  REGION DETAIL
      UNUSED SPACE AT START
--->  
      __TEXT                      1047e4000-1047e8000    [   16K] r-x/r-x SM=COW  /Users/USER/Library/Developer/CoreSimulator/Devices/CFCFA94A-B021-4B65-AD60-835A2BC247GT/data/Containers/Bundle/Application/4887C6DF-B82E-42BA-9AF1-83B6477F6YTS/Runner.app/Runner
Termination Reason: SIGNAL 11 Segmentation fault: 11
Terminating Process: exc handler [4908]

Triggered by Thread:  0

Kernel Triage:
VM - (arg = 0x3) mach_vm_allocate_kernel failed within call to vm_map_enter
VM - (arg = 0x3) mach_vm_allocate_kernel failed within call to vm_map_enter
VM - (arg = 0x3) mach_vm_allocate_kernel failed within call to vm_map_enter
VM - (arg = 0x3) mach_vm_allocate_kernel failed within call to vm_map_enter
VM - (arg = 0x3) mach_vm_allocate_kernel failed within call to vm_map_enter


Thread 0 Crashed::  Dispatch queue: com.apple.main-thread
0   ???                           	               0x0 ???
1   flutter_inappwebview_ios      	       0x104f48b3c specialized InAppWebView.observeValue(forKeyPath:of:change:context:) + 132 (InAppWebView.swift:714)
2   flutter_inappwebview_ios      	       0x104f2be64 InAppWebView.observeValue(forKeyPath:of:change:context:) + 20 [inlined]
3   flutter_inappwebview_ios      	       0x104f2be64 @objc InAppWebView.observeValue(forKeyPath:of:change:context:) + 256 (/<compiler-generated>:711)
4   Foundation                    	       0x180eb3200 NSKeyValueNotifyObserver + 248
5   Foundation                    	       0x180eb61e0 NSKeyValueDidChange + 380
6   Foundation                    	       0x180eb276c NSKeyValueDidChangeWithPerThreadPendingNotifications + 144
7   WebKit                        	       0x18c728a1c WebKit::NavigationState::didChangeEstimatedProgress() + 36
8   WebKit                        	       0x18ca2cfa4 WebKit::PageLoadState::callObserverCallback(void (WebKit::PageLoadStateObserverBase::*)()) + 760
9   WebKit                        	       0x18ca2ca3c WebKit::PageLoadState::commitChanges() + 916
10  WebKit                        	       0x18ca7dc04 WebKit::WebPageProxy::didStartProgress() + 136
11  WebKit                        	       0x18c5e7518 WebKit::WebPageProxy::didReceiveMessage(IPC::Connection&, IPC::Decoder&) + 2652
12  WebKit                        	       0x18d03a238 IPC::MessageReceiverMap::dispatchMessage(IPC::Connection&, IPC::Decoder&) + 260
13  WebKit                        	       0x18caed9b4 WebKit::WebProcessProxy::dispatchMessage(IPC::Connection&, IPC::Decoder&) + 36
14  WebKit                        	       0x18c62206c WebKit::WebProcessProxy::didReceiveMessage(IPC::Connection&, IPC::Decoder&) + 1460
15  WebKit                        	       0x18d0286f4 IPC::Connection::dispatchMessage(WTF::UniqueRef<IPC::Decoder>) + 724
16  WebKit                        	       0x18d028b3c IPC::Connection::dispatchIncomingMessages() + 492
17  JavaScriptCore                	       0x19815a9f0 WTF::RunLoop::performWork() + 444
18  JavaScriptCore                	       0x19815b624 WTF::RunLoop::performWork(void*) + 32
19  CoreFoundation                	       0x1804284b8 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 24
20  CoreFoundation                	       0x180428400 __CFRunLoopDoSource0 + 168
21  CoreFoundation                	       0x180427b88 __CFRunLoopDoSources0 + 220
22  CoreFoundation                	       0x180422584 __CFRunLoopRun + 780
23  CoreFoundation                	       0x180421e3c CFRunLoopRunSpecific + 536
24  GraphicsServices              	       0x190f62d00 GSEventRunModal + 164
25  UIKitCore                     	       0x185bcec98 -[UIApplication _run] + 796
26  UIKitCore                     	       0x185bd3064 UIApplicationMain + 124
27  UIKitCore                     	       0x184f9ad6c 0x184d72000 + 2264428
28  Runner.debug.dylib            	       0x104819ea4 static UIApplicationDelegate.main() + 128
29  Runner.debug.dylib            	       0x104819e14 static AppDelegate.$main() + 44
30  Runner.debug.dylib            	       0x104819f20 __debug_main_executable_dylib_entry_point + 28
31  ???                           	       0x1049353d8 ???
32  dyld                          	       0x104b92b4c start + 6000
``` 

The Flutter application crashes and closes the application.

Simulator:
Iphone 16 Pro Simulator iOS 18.4

Xcode version:
16.3

MacOS version:
15.4

flutter_inappwebview version:
^6.1.5

Flutter version:
3.29.0

Dart version:
3.7.0

### Expected Behavior

The Flutter application doesn't crash and shows the content of the page when being pushed.

### Steps with code example to reproduce


```dart
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter_inappwebview/flutter_inappwebview.dart';

class WebViewTab extends StatefulWidget {
  const WebViewTab({super.key, this.initialUrl, this.windowId})
    : assert(
        (initialUrl == null) != (windowId == null),
        'Either [initialUrl] or [windowId] should be set, but not both',
      );

  final String? initialUrl;
  final int? windowId;

  @override
  State<WebViewTab> createState() => _WebViewTabState();
}

class _WebViewTabState extends State<WebViewTab> {
  InAppWebViewController? _webViewController;
  bool _isLoading = true;
  bool _hasError = false;

  static const String _keyPrefix = 'web_view_tab_';

  @override
  void dispose() {
    _webViewController?.dispose();
    _webViewController = null;
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Stack(
      children: [
        InAppWebView(
          key: ValueKey('$_keyPrefix${widget.windowId ?? 'root'}'),
          initialSettings: InAppWebViewSettings(
            isInspectable: kDebugMode,
            javaScriptCanOpenWindowsAutomatically: true,
            supportMultipleWindows: true,
            supportZoom: false,
            allowsLinkPreview: false,
            disableLongPressContextMenuOnLinks: true,
          ),
          windowId: widget.windowId,
          initialUrlRequest:
              widget.initialUrl != null
                  ? URLRequest(url: WebUri(widget.initialUrl!))
                  : null,
          onWebViewCreated: _handleWebViewCreated,
          onLoadStop: _handleLoadStop,
          onReceivedError: _handleReceivedError,
          onCreateWindow: (_, action) => _handleCreateWindow(context, action),
          onCloseWindow: (_) => _handleCloseWindow(context),
        ),
        if (_isLoading) const CircularProgressIndicator(),
      ],
    );
  }

  void _handleWebViewCreated(InAppWebViewController controller) {
    _webViewController = controller;
  }

  void _handleLoadStop(InAppWebViewController _, WebUri? _) {
    setState(() => _isLoading = false);
  }

  void _handleReceivedError(
    InAppWebViewController _,
    WebResourceRequest _,
    WebResourceError _,
  ) {
    setState(() {
      _isLoading = false;
      _hasError = true;
    });
  }

  Future<dynamic>? _evaluateJavascript(String code) {
    return _webViewController?.evaluateJavascript(source: code);
  }

  Future<bool> _handleCreateWindow(
    BuildContext context,
    CreateWindowAction action,
  ) async {
    Navigator.of(context).push(
      MaterialPageRoute(
        builder: (_) => WebViewTab(windowId: action.windowId),
      ),
    );
    return true;
  }

  void _handleCloseWindow(BuildContext context) {
    Navigator.of(context).maybePop();
  }
}

```
</details>


### Stacktrace/Logs

<details>
<summary>Stacktrace/Logs</summary>

```
Exception Type:  EXC_BAD_ACCESS (SIGSEGV)
Exception Subtype: KERN_INVALID_ADDRESS at 0x0000000000000000
Exception Codes: 0x0000000000000001, 0x0000000000000000
VM Region Info: 0 is not in any region.  Bytes before following region: 4370350080
      REGION TYPE                    START - END         [ VSIZE] PRT/MAX SHRMOD  REGION DETAIL
      UNUSED SPACE AT START
--->  
      __TEXT                      1047e4000-1047e8000    [   16K] r-x/r-x SM=COW  /Users/USER/Library/Developer/CoreSimulator/Devices/CFCFA94A-B021-4B65-AD60-835A2BC247GT/data/Containers/Bundle/Application/4887C6DF-B82E-42BA-9AF1-83B6477F6YTS/Runner.app/Runner
Termination Reason: SIGNAL 11 Segmentation fault: 11
Terminating Process: exc handler [4908]

Triggered by Thread:  0

Kernel Triage:
VM - (arg = 0x3) mach_vm_allocate_kernel failed within call to vm_map_enter
VM - (arg = 0x3) mach_vm_allocate_kernel failed within call to vm_map_enter
VM - (arg = 0x3) mach_vm_allocate_kernel failed within call to vm_map_enter
VM - (arg = 0x3) mach_vm_allocate_kernel failed within call to vm_map_enter
VM - (arg = 0x3) mach_vm_allocate_kernel failed within call to vm_map_enter


Thread 0 Crashed::  Dispatch queue: com.apple.main-thread
0   ???                           	               0x0 ???
1   flutter_inappwebview_ios      	       0x104f48b3c specialized InAppWebView.observeValue(forKeyPath:of:change:context:) + 132 (InAppWebView.swift:714)
2   flutter_inappwebview_ios      	       0x104f2be64 InAppWebView.observeValue(forKeyPath:of:change:context:) + 20 [inlined]
3   flutter_inappwebview_ios      	       0x104f2be64 @objc InAppWebView.observeValue(forKeyPath:of:change:context:) + 256 (/<compiler-generated>:711)
4   Foundation                    	       0x180eb3200 NSKeyValueNotifyObserver + 248
5   Foundation                    	       0x180eb61e0 NSKeyValueDidChange + 380
6   Foundation                    	       0x180eb276c NSKeyValueDidChangeWithPerThreadPendingNotifications + 144
7   WebKit                        	       0x18c728a1c WebKit::NavigationState::didChangeEstimatedProgress() + 36
8   WebKit                        	       0x18ca2cfa4 WebKit::PageLoadState::callObserverCallback(void (WebKit::PageLoadStateObserverBase::*)()) + 760
9   WebKit                        	       0x18ca2ca3c WebKit::PageLoadState::commitChanges() + 916
10  WebKit                        	       0x18ca7dc04 WebKit::WebPageProxy::didStartProgress() + 136
11  WebKit                        	       0x18c5e7518 WebKit::WebPageProxy::didReceiveMessage(IPC::Connection&, IPC::Decoder&) + 2652
12  WebKit                        	       0x18d03a238 IPC::MessageReceiverMap::dispatchMessage(IPC::Connection&, IPC::Decoder&) + 260
13  WebKit                        	       0x18caed9b4 WebKit::WebProcessProxy::dispatchMessage(IPC::Connection&, IPC::Decoder&) + 36
14  WebKit                        	       0x18c62206c WebKit::WebProcessProxy::didReceiveMessage(IPC::Connection&, IPC::Decoder&) + 1460
15  WebKit                        	       0x18d0286f4 IPC::Connection::dispatchMessage(WTF::UniqueRef<IPC::Decoder>) + 724
16  WebKit                        	       0x18d028b3c IPC::Connection::dispatchIncomingMessages() + 492
17  JavaScriptCore                	       0x19815a9f0 WTF::RunLoop::performWork() + 444
18  JavaScriptCore                	       0x19815b624 WTF::RunLoop::performWork(void*) + 32
19  CoreFoundation                	       0x1804284b8 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 24
20  CoreFoundation                	       0x180428400 __CFRunLoopDoSource0 + 168
21  CoreFoundation                	       0x180427b88 __CFRunLoopDoSources0 + 220
22  CoreFoundation                	       0x180422584 __CFRunLoopRun + 780
23  CoreFoundation                	       0x180421e3c CFRunLoopRunSpecific + 536
24  GraphicsServices              	       0x190f62d00 GSEventRunModal + 164
25  UIKitCore                     	       0x185bcec98 -[UIApplication _run] + 796
26  UIKitCore                     	       0x185bd3064 UIApplicationMain + 124
27  UIKitCore                     	       0x184f9ad6c 0x184d72000 + 2264428
28  Runner.debug.dylib            	       0x104819ea4 static UIApplicationDelegate.main() + 128
29  Runner.debug.dylib            	       0x104819e14 static AppDelegate.$main() + 44
30  Runner.debug.dylib            	       0x104819f20 __debug_main_executable_dylib_entry_point + 28
31  ???                           	       0x1049353d8 ???
32  dyld                          	       0x104b92b4c start + 6000
```
</details>


### Flutter version

v3.29.0

### Operating System, Device-specific and/or Tool

Iphone 16 Pro iOS 18.4 
Xcode 16.3

### Plugin version

^6.1.5

### Additional information

_No response_

### Self grab

- [ ] I'm ready to work on this issue!

Provide feedback

Saved searches

Use saved searches to filter your results more quickly

Uh oh!

Uh oh!

iOS app CRASH when using `windowId` in `InAppWebView` #2600

Is there an existing issue for this?

Current Behavior

Expected Behavior

Steps with code example to reproduce

Stacktrace/Logs

Flutter version

Operating System, Device-specific and/or Tool

Plugin version

Additional information

Self grab

Metadata

Assignees

Labels

Projects

Milestone

Relationships

Development

Uh oh!

iOS app CRASH when using windowId in InAppWebView #2600

Description

Is there an existing issue for this?

Current Behavior

Expected Behavior

Steps with code example to reproduce

Stacktrace/Logs

Flutter version

Operating System, Device-specific and/or Tool

Plugin version

Additional information

Self grab

Metadata

Metadata

Assignees

Labels

Projects

Milestone

Relationships

Development

Issue actions

iOS app CRASH when using `windowId` in `InAppWebView` #2600