App hangs when viewing specific PDF files using syncfusion_flutter_pdfviewer with no error logs

[josephdev9]

Bug description

When opening certain PDF files using the SfPdfViewer widget from the syncfusion_flutter_pdfviewer package, the app suddenly hangs or becomes unresponsive. This issue occurs on both iOS and Android platforms.

Notably, there are no logs or stack traces printed in the console — the app simply freezes without any feedback. The issue seems to occur during or shortly after rendering begins, potentially in the build or parsing phase.

Steps to reproduce

Load this file via network, memory, or file: crashing2.pdf

Code sample

Code sample

  return  Scaffold(
      appBar: AppBar(
        backgroundColor: Colors.pink,
      ),
      body: SfPdfViewer.network(
        'https://github.com/user-attachments/files/21480491/crashing2.pdf',
      ),
    );

Screenshots or Video

Screenshots / Video demonstration

Stack Traces

Stack Traces

No logs shown

On which target platforms have you observed this bug?

Android, iOS

Flutter Doctor output

Doctor output

[✓] Flutter (Channel stable, 3.32.0, on macOS 15.5 24F74 darwin-arm64, locale en-PH) [887ms]
    • Flutter version 3.32.0 on channel stable at /Users/dev9/fvm/versions/3.32.0
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision be698c48a6 (2 months ago), 2025-05-19 12:59:14 -0700
    • Engine revision 1881800949
    • Dart version 3.8.0
    • DevTools version 2.45.1

[✓] Android toolchain - develop for Android devices (Android SDK version 34.0.0) [5.5s]
    • Android SDK at /Users/dev9/Library/Android/sdk
    • Platform android-35, build-tools 34.0.0
    • Java binary at: /Applications/Android Studio.app/Contents/jbr/Contents/Home/bin/java
      This is the JDK bundled with the latest Android Studio installation on this machine.
      To manually set the JDK path, use: `flutter config --jdk-dir="path/to/jdk"`.
    • Java version OpenJDK Runtime Environment (build 17.0.6+0-17.0.6b802.4-9586694)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 16.1) [2.6s]
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Build 16B40
    • CocoaPods version 1.16.2

[✓] Chrome - develop for the web [13ms]
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 2022.2) [12ms]
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 17.0.6+0-17.0.6b802.4-9586694)

[✓] VS Code (version 1.102.2) [10ms]
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.114.0

[✓] Connected device (2 available) [7.8s]
    • macOS (desktop)   • macos       • darwin-arm64   • macOS 15.5 24F74 darwin-arm64
    • Chrome (web)      • chrome      • web-javascript • Google Chrome 138.0.7204.169

[✓] Network resources [3.5s]
    • All expected network resources are available.

• No issues found!

Notes:

• The issue only occurs with PDFs that contain form fields.
• Wrapping the viewer in try-catch or using onDocumentLoadFailed does not catch the error.
• The same PDF may work when viewed in other PDF readers.

Thank you for your support!
Please let me know if I can provide any additional information or sample files to help investigate this issue.

[immankumarsync]

Hi @josephdev9,
We are able to replicate the reported issue that the application hangs when opening the specific PDF document in SfPdfViewer widget. Currently, we are validating this issue, and we will provide further updates on July 31, 2025.

[immankumarsync]

@josephdev9, we have confirmed the issue that the application hangs when accessing the read only value of a specific form field is a defect in the product. The fix will be included in the upcoming weekly release is scheduled for August 19, 2025.

Please find the feedback link to track the status of the bug,
Application hangs when accessing form fields in Flutter PDF

Disclaimer: "Inclusion of this solution in the weekly release may change due to other factors including but not limited to QA checks and works reprioritization."