Unhandled Exception: LateInitializationError on PngEncoder()..isAnimated = true.addFrame()

[ghost]

Launching lib\main.dart on FIG LX1 in debug mode...
lib\main.dart:1
√ Built build\app\outputs\flutter-apk\app-debug.apk.
Connecting to VM Service at ws://127.0.0.1:53001/mRnZc_Ezr-I=/ws
D/AwareBitmapCacher(11693): handleInit switch not opened pid=11693
Reloaded 2 of 1065 libraries in 1,502ms.
V/AudioManager(11693): playSoundEffect   effectType: 0
V/AudioManager(11693): querySoundEffectsEnabled...
E/flutter (11693): [ERROR:flutter/lib/ui/ui_dart_state.cc(186)] Unhandled Exception: LateInitializationError: Field '_frames@702470414' has not been initialized.
E/flutter (11693): #0      PngEncoder._frames (package:image/src/formats/png_encoder.dart)
package:image/…/formats/png_encoder.dart:1
E/flutter (11693): #1      PngEncoder._writeAnimationControlChunk
package:image/…/formats/png_encoder.dart:124
E/flutter (11693): #2      PngEncoder.addFrame
package:image/…/formats/png_encoder.dart:35
E/flutter (11693): #3      PainterPageState.build.<anonymous closure>
package:gif_maker/painter.dart:43
E/flutter (11693): #4      _WidgetRecorderState._getSnapshot
package:widget_recorder/widget_recorder.dart:100
E/flutter (11693): <asynchronous suspension>
E/flutter (11693): #5      WidgetRecorderPeriodicController._takeSnapshot
package:widget_recorder/src/widget_recorder_periodic_controller.dart:55
E/flutter (11693): <asynchronous suspension>
E/flutter (11693):
Exited (1)

[brendan-duncan]

Thanks for catching this, I just pushed a fix and will update the version.

Are you doing something specific calling addFrame directly instead of encodeImage or encodeAnimation? If you're adding multiple frames and not using encodeAnimation, you'll want to set pngEcoder.isAnimated = true prior to calling pngEncoder.addFrame(), so that it knows to add the animation control chunk to the PNG data. And don't forget to call pngEncoder.finish() after you're done calling addFrame, so it writes the end data chunk.