Repository: flutter
Issue: [iPad] Tapping a blank area in a composing region in a TextField with `stylusHandwritingEnabled:false` makes the application crash
Labels: c: crash,platform-ios,a: tablet,has reproducible steps,P2,c: fatal crash,team-text-input,triaged-text-input,found in release: 3.27

### Steps to reproduce

1.  launch app;
2. input chinese , IME bar show;
4. tap on a blank area;


### Expected results

app not crash

### Actual results

app crash

### Code sample

<details open><summary>Code sample</summary>

```dart
// ignore_for_file: avoid_print

import 'package:flutter/material.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
        useMaterial3: true,
      ),
      home: const MyHomePage(title: 'TextField dismiss'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key, required this.title});

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  final FocusNode node = FocusNode();

  final ScrollController scrollController = ScrollController();

  // final QuillController controller = QuillController.basic();

  void onDismissClick() {
    print('[log] : dissmiss click at  ${DateTime.now()}');
    FocusManager.instance.primaryFocus?.unfocus();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('dismiss not work'),
      ),
      // body: quillWidget(),
      body: const Column(
        children: <Widget>[
          Expanded(
            child: TextField(
              // scribbleEnabled: false,
              stylusHandwritingEnabled: false,
              autofocus: true,
              maxLines: 100,
            ),
          ),
        ],
      ),
    );
  }
}

```
</details>


### Screenshots or Video

<details open>
<summary>Screenshots / Video demonstration</summary>

https://github.com/user-attachments/assets/3e1cfd23-72b2-4262-ad72-370ac9d526f3


 

</details>


### Logs

<details open><summary>Logs</summary>

```console
2024-12-10 11:47:43.363754+0800 Runner[6843:342629] flutter: The Dart VM service is listening on http://127.0.0.1:56344/XfBcMkYLPwM=/
2024-12-10 11:47:47.603782+0800 Runner[6843:342346] *** Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[__NSArray0 objectAtIndex:]: index 0 beyond bounds for empty NSArray'
*** First throw call stack:
(0x1812a2d78 0x199f07734 0x18132b258 0x107c022c0 0x1841fabd8 0x183ad0358 0x183a6974c 0x183aa3bb4 0x1838e42cc 0x18380ed00 0x18381c0e4 0x1839c9ae4 0x1837ef9ec 0x1837e471c 0x184634470 0x183e52084 0x1844d7cb0 0x1844d7478 0x1812c4f04 0x1812d5c90 0x18120f184 0x181214b4c 0x1812286b8 0x19d2c2374 0x183b8de88 0x18390f5ec 0x198f04ecc 0x104af060c 0x104af0584 0x104af0688 0x104c8dce4)
libc++abi: terminating with uncaught exception of type NSException
```

</details>


### Flutter Doctor output

<details open><summary>Doctor output</summary>

```console
fvm flutter --version        
Flutter 3.27.0-1.0.pre.745 • channel master • https://github.com/flutter/flutter.git
Framework • revision 69ae667301 (20 hours ago) • 2024-12-09 02:49:32 -0500
Engine • revision 13231e3e48
Tools • Dart 3.7.0 (build 3.7.0-224.0.dev) • DevTools 2.41.0
```

</details>