Unexpected null value error on even simple widget

I am writing this widget
```dart
import 'package:flutter/material.dart';
import 'package:marquee/marquee.dart';

class TestScreen extends StatelessWidget {
const TestScreen({super.key});

@override
Widget build(BuildContext context) {
return Container(
child: SizedBox(
height: 50,
child: Marquee(
text: "Hello to this is sample marquee",
crossAxisAlignment: CrossAxisAlignment.center,
blankSpace: 20,
),
),
);
}
}

```

Eventhough the app runs and displays the marquee in terminal following error is shown

```log
Error: Unexpected null value.
C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/_internal/js_dev_runtime/priv
ate/ddc_runtime/errors.dart 266:49 throw_
C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/_internal/js_dev_runtime/priv
ate/ddc_runtime/operations.dart 528:63 nullCheck
packages/flutter/src/widgets/scroll_position.dart 141:49
get minScrollExtent
packages/flutter/src/widgets/scroll_position.dart 668:18
[_updateSemanticActions]
packages/flutter/src/widgets/scroll_position.dart 984:5
notifyListeners
packages/flutter/src/widgets/scroll_position.dart 384:5
forcePixels
packages/flutter/src/widgets/scroll_position_with_single_context.dart 197:7
jumpTo
packages/flutter/src/widgets/scroll_controller.dart 172:15
jumpTo
packages/marquee/marquee.dart 548:23

C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/_internal/js_dev_runtime/patc
h/async_patch.dart 84:54 runBody
C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/_internal/js_dev_runtime/patc
h/async_patch.dart 123:5 _async
packages/marquee/marquee.dart 544:51

packages/flutter/src/scheduler/binding.dart 1175:15
[_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart 1113:9
handleDrawFrame
packages/flutter/src/scheduler/binding.dart 1015:5
[_handleDrawFrame]
C:/b/s/w/ir/cache/builder/src/out/host_debug/flutter_web_sdk/lib/_engine/engine/platfor
m_dispatcher.dart 1168:13 invoke
C:/b/s/w/ir/cache/builder/src/out/host_debug/flutter_web_sdk/lib/_engine/engine/platfor
m_dispatcher.dart 219:5 invokeOnDrawFrame
C:/b/s/w/ir/cache/builder/src/out/host_debug/flutter_web_sdk/lib/_engine/engine/initial
ization.dart 195:45
C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/_internal/js_dev_runtime/priv
ate/ddc_runtime/operations.dart 334:14 _checkAndCall
C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/_internal/js_dev_runtime/priv
ate/ddc_runtime/operations.dart 339:39 dcall

```

Why is this happening and how to resolve this?

Start in packages/marquee/marquee.dart around lines 544-548, where the stack trace shows the widget calling ScrollController.jumpTo, and compare that with Flutter's scroll_position.dart failure at minScrollExtent. Reproduce the provided widget on Flutter web and identify why the scroll position is unavailable; done means the example no longer reports the unexpected null value while the marquee still displays.

Written by the indexing model from the issue text.