'package:flutter/src/rendering/stack.dart': Failed assertion: line 664 pos 12: 'size.isFinite': is not true. #172481
Description
Steps to reproduce
Run the code sample.
Expected results
Probably an error message, but one that actually has detail.
Actual results
I get an assertion that tells me to file a bug.
Code sample
Code sample
import 'package:flutter/material.dart';
void main() {
runApp(
Directionality(
textDirection: TextDirection.ltr,
child: Column(
children: [
Stack(children: [Positioned(top:0,child: SizedBox())]),
],
),
),
);
}Screenshots or Video
No response
Logs
Flutter Doctor output
Doctor output
[✓] Flutter (Channel main, 3.33.0-1.0.pre-1039, on macOS 14.6.1 23G93 darwin-arm64, locale en-US) [1,230ms]
• Flutter version 3.33.0-1.0.pre-1039 on channel main at /Users/user/dev/flutter
• Upstream repository https://github.com/flutter/flutter.git
• Framework revision 70cdc0c933 (2 hours ago), 2025-07-21 12:09:22 -0400
• Engine revision 70cdc0c933
• Dart version 3.10.0 (build 3.10.0-15.0.dev)
• DevTools version 2.48.0
• Feature flags: enable-web, enable-linux-desktop, enable-macos-desktop, enable-windows-desktop, enable-android, enable-ios, cli-animations, enable-native-assets
[✗] Android toolchain - develop for Android devices [116ms]
✗ Unable to locate Android SDK.
Install Android Studio from: https://developer.android.com/studio/index.html
On first launch it will assist you in installing the Android SDK components.
(or visit https://flutter.dev/to/macos-android-setup for detailed instructions).
If the Android SDK has been installed to a custom location, please use
`flutter config --android-sdk` to update to that location.
[!] Xcode - develop for iOS and macOS (Xcode 16.2) [1,044ms]
• Xcode at /Applications/Xcode.app/Contents/Developer
• Build 16C5032a
✗ Unable to get list of installed Simulator runtimes.
• CocoaPods version 1.16.2
[✓] Chrome - develop for the web [7ms]
• Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome
[!] Android Studio (not installed) [6ms]
• Android Studio not found; download from https://developer.android.com/studio/index.html
(or visit https://flutter.dev/to/macos-android-setup for detailed instructions).
[✓] VS Code (version 1.101.2) [6ms]
• VS Code at /Applications/Visual Studio Code.app/Contents
• Flutter extension version 3.114.0
[✓] Connected device (2 available) [5.7s]
• macOS (desktop) • macos • darwin-arm64 • macOS 14.6.1 23G93 darwin-arm64
• Chrome (web) • chrome • web-javascript • Google Chrome 138.0.7204.158
[✓] Network resources [499ms]
• All expected network resources are available.
! Doctor found issues in 3 categories.Metadata
Metadata
Assignees
Labels
Important issues not at the top of the work listError messages from the Flutter frameworkA detailed proposal for a change to Flutterflutter/packages/flutter/material repository.flutter/packages/flutter repository. See also f: labels.Relatively approachable for first-time contributorsIssue is closed as already fixed in a newer versionOwned by Framework teamTriaged by Framework team