App crashes using showNormalDistributionCurve with insufficient data

[simprecicchiani]

Bug description

Plotting an HistogramSeries in SfCartesianChart with dataSource with 1 data point and showNormalDistributionCurve set to true seems to crash the entire app (tested on Chrome and iOS Simulator) and I can't see any stack trace from vscode debugger.

Steps to reproduce

plot an histogram series with 1 data point and set showNormalDistributionCurve: true

Code sample

Code sample

  @override
  Widget build(BuildContext context) {
    return SfCartesianChart(
      series: [
        HistogramSeries(
          dataSource: [1],
          yValueMapper: (e, i) => e,
          showNormalDistributionCurve: true,
        ),
      ],
    );
  }

Stack Traces

Stack Traces

Exhausted heap space, trying to allocate 1760 bytes.
[ERROR:flutter/shell/common/shell.cc(115)] Dart Error: Out of memory
Application finished.

On which target platforms have you observed this bug?

iOS

Flutter Doctor output

Doctor output

[✓] Flutter (Channel stable, 3.29.2, on macOS 15.3.2 24D81 darwin-arm64, locale en-US) [903ms]
    • Flutter version 3.29.2 on channel stable at /opt/homebrew/Caskroom/flutter/3.16.5/flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision c236373904 (5 weeks ago), 2025-03-13 16:17:06 -0400
    • Engine revision 18b71d647a
    • Dart version 3.7.2
    • DevTools version 2.42.3

[✗] Android toolchain - develop for Android devices [829ms]
    ✗ 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 16.3) [1,689ms]
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Build 16E140
    • CocoaPods version 1.16.2

[✓] Chrome - develop for the web [10ms]
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[!] Android Studio (not installed) [9ms]
    • 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 1.99.2) [9ms]
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.108.0

[✓] Connected device (6 available) [5.9s]
    • iPhone 16 (mobile)                           • 044837D9-0C49-4690-BF96-E6C91A231E01 • ios            •
      com.apple.CoreSimulator.SimRuntime.iOS-18-4 (simulator)
    • macOS (desktop)                              • macos                                • darwin-arm64   • macOS 15.3.2 24D81
      darwin-arm64
    • Mac Designed for iPad (desktop)              • mac-designed-for-ipad                • darwin         • macOS 15.3.2 24D81
      darwin-arm64
    • Chrome (web)                                 • chrome                               • web-javascript • Google Chrome
      135.0.7049.85

[✓] Network resources [700ms]
    • All expected network resources are available.

! Doctor found issues in 2 categories.

[ManiKesavaraj]

Hi Simprecicchiani,

We have reproduced the issue you reported on our end and the issue is scheduled to be fixed in our upcoming weekly patch release on Apr 29, 2025. We will notify you here once the release has been rolled out, and we appreciate your patience in the meantime. 

Root cause: Calculated deviation becomes NaN due to division by zero (from data length 1), which causes an infinite loop and leads to an out-of-memory crash. 

Regards,
Naveen K.

[Mugunthan-Ramalingam]

Hi @simprecicchiani,

The reported issue has been fixed and rolled out in our weekly patch release on April 29, 2025. So, we kindly request you to upgrade the syncfusion_flutter_charts package to the latest version below.

Version: https://pub.dev/packages/syncfusion_flutter_charts/versions/29.1.40

Root cause: Calculated deviation becomes NaN due to division by zero (from data length 1), which causes an infinite loop and leads to an out-of-memory crash.

Demo:

Note: In a HistogramSeries, when only a single data point is provided, the segment will occupy the full chart area by default. This is consistent with other Side-by-Side (SBS) type series. To adjust the segment width, you can use the width property of the HistogramSeries. Please refer to the following demo for reference.

Demo:

Regards,
Mugunthan.