Creating an empty Vertices object causes an exception on web (canvaskit) #160355

Activity

1. gspencergoog

   added

   c: regressionIt was better in the past than it is nowIt was better in the past than it is now

   engineflutter/engine related. See also e: labels.flutter/engine related. See also e: labels.

   platform-webWeb applications specificallyWeb applications specifically

   c: renderingUI glitches reported at the engine/skia or impeller rendering levelUI glitches reported at the engine/skia or impeller rendering level

   on Dec 16, 2024
2. gspencergoog

   changed the title [-]Creating an empty `Vertices` object causes an exception on web[/-] [+]Creating an empty `Vertices` object causes an exception on web (canvaskit)[/+] on Dec 16, 2024
3. gspencergoog commented on Dec 16, 2024

   

   gspencergoog

   on Dec 16, 2024

   ContributorAuthor

   More actions

   No longer blocking the roll, because cl/705912913 was submitted.
4. yjbanov

   added

   c: crashStack traces logged to the consoleStack traces logged to the console

   e: web_canvaskitCanvasKit (a.k.a. Skia-on-WebGL) rendering backend for WebCanvasKit (a.k.a. Skia-on-WebGL) rendering backend for Web

   P1High-priority issues at the top of the work listHigh-priority issues at the top of the work list

   team-webOwned by Web platform teamOwned by Web platform team

   triaged-webTriaged by Web platform teamTriaged by Web platform team

   on Dec 16, 2024
5. harryterkelsen

   self-assigned this

   on Jan 29, 2025
6. github-merge-queue

   added a commit that references this issue on Jan 31, 2025

   [web] Gracefully handle empty ui.Vertices (#162461)

   ...

   385878e
7. auto-submit

   closed this as completedin #162461on Jan 31, 2025
8. github-actions commented on Feb 14, 2025

   

   github-actionsbot

   on Feb 14, 2025 – with GitHub Actions

   More actions

   This thread has been automatically locked since there has not been any recent activity after it was closed. If you are still experiencing a similar issue, please open a new bug, including the output of flutter doctor -v and a minimal reproduction of the issue.
9. github-actions

   locked as resolved and limited conversation to collaborators on Feb 14, 2025
10. filiph commented on May 14, 2025

    

    filiph

    on May 14, 2025

    Contributor

    More actions

    I see this was fixed a while ago but I'm seeing the same or very similar error when calling the following constructor on the web:

      final vertices = Vertices(
        VertexMode.triangles,
        positions,  // A list of Offsets. Works well on other platforms.
      );

    The error:

    ======== Exception caught by rendering library =====================================================
    The following _TypeError was thrown during paint():
    TypeError: null: type 'Null' is not a subtype of type 'JavaScriptObject'
    
    The relevant error-causing widget was: 
      RenderGameWidget RenderGameWidget:file:///Users/filiph/.pub-cache/hosted/pub.dev/flame-1.27.0/lib/src/game/game_widget/game_widget.dart:333:36
    When the exception was thrown, this was the stack: 
    dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 307:3      throw_
    dart-sdk/lib/_internal/js_dev_runtime/private/profile.dart 117:39                _failedAsCheck
    dart-sdk/lib/_internal/js_shared/lib/rti.dart 1554:3                             _generalAsCheckImplementation
    dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/operations.dart 266:9  callMethod$
    lib/_engine/engine/canvaskit/canvaskit_api.dart 94:8                             CanvasKitExtension.MakeVertices
    lib/_engine/engine/canvaskit/vertices.dart 68:45                                 __
    lib/_engine/engine/canvaskit/vertices.dart 27:23                                 new
    lib/_engine/engine/canvaskit/renderer.dart 105:9                                 createVertices
    lib/ui/canvas.dart 21:28                                                         new
    packages/giant_robot/game/map/smoke/render_smoke.dart 214:20                     renderSmoke
    packages/giant_robot/game/map/game_map_component.dart 171:5                      render
    ...
    

    Flutter version:

    [✓] Flutter (Channel stable, 3.29.3, on macOS 14.7.4 23H420 darwin-arm64,
        locale en-US) [3.3s]
        • Flutter version 3.29.3 on channel stable at
          /Users/filiph/fvm/versions/stable
        • Upstream repository https://github.com/flutter/flutter.git
        • Framework revision ea121f8859 (5 weeks ago), 2025-04-11 19:10:07 +0000
        • Engine revision cf56914b32
        • Dart version 3.7.2
        • DevTools version 2.42.3
    
    [✓] Android toolchain - develop for Android devices (Android SDK version
        35.0.0) [4.1s]
        • Android SDK at /Users/filiph/Library/Android/sdk
        • Platform android-35, build-tools 35.0.0
        • Java binary at: /usr/bin/java
          This JDK was found in the system PATH.
          To manually set the JDK path, use: `flutter config
          --jdk-dir="path/to/jdk"`.
        • Java version OpenJDK Runtime Environment (build 19+36-2238)
        • All Android licenses accepted.
    
    [✓] Xcode - develop for iOS and macOS (Xcode 16.2) [3.1s]
        • Xcode at /Applications/Xcode.app/Contents/Developer
        • Build 16C5032a
        • CocoaPods version 1.16.2
    
    [✓] Chrome - develop for the web [106ms]
        • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome
    
    [!] Android Studio (not installed) [106ms]
        • 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).
    
    [✓] IntelliJ IDEA Ultimate Edition (version 2025.1.1.1) [105ms]
        • IntelliJ at /Users/filiph/Applications/IntelliJ IDEA Ultimate.app
        • Flutter plugin version 85.2.4
        • Dart plugin version 251.25410.28
    
    [✓] VS Code (version 1.92.2) [13ms]
        • VS Code at /Applications/Visual Studio Code.app/Contents
        • Flutter extension version 3.84.0
    
    [✓] Connected device (3 available) [6.4s]
        • macOS (desktop)                 • macos                 • darwin-arm64
          • macOS 14.7.4 23H420 darwin-arm64
        • Mac Designed for iPad (desktop) • mac-designed-for-ipad • darwin
          • macOS 14.7.4 23H420 darwin-arm64
        • Chrome (web)                    • chrome                •
          web-javascript • Google Chrome 136.0.7103.93
    
    [✓] Network resources [634ms]
        • All expected network resources are available.
    
    ! Doctor found issues in 1 category.
    

    Should I create a new issue then?
11. harryterkelsen commented on Jun 4, 2025

    

    harryterkelsen

    on Jun 4, 2025

    Contributor

    More actions

    @filiph Please open another issue if you are still hitting this error, thanks!