App crashes spontaneously while drawing

[ConschiB]

First of all, thanks for this package, I do like it a lot!

However, recently I got noticed that a few users experienced app crashes while or after drawing a signature. I saw these crashes also on Firebase Crashlytics.

Is this a known issue or is there any way to avoid this?

(I use the Signature Component exactly like the example-code in the ReadMe section on PubDev)

[egfconnor]

I am seeing the same issue.

[MartinHlavna]

This is interesting, it looks like the setState itsfelt is crashing.

@egfconnor can you maybe reproduce this? Maybe there are another errors in logs that may shine some light on this.

[justinlettau]

I also see this in logs, but haven't been able to reproduce it locally. Using signature v5.5.0.

Stack trace:

TypeError: Null check operator used on a null value
  #0      State.setState (package:flutter/src/widgets/framework.dart:1223)
  #1      SignatureState._addPoint (package:signature/signature.dart:174)
  #2      SignatureState.build.<fn>.<fn> (package:signature/signature.dart:112)
  #3      RenderPointerListener.handleEvent (package:flutter/src/rendering/proxy_box.dart:3078)
  #4      GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:481)
  #5      RendererBinding.dispatchEvent (package:flutter/src/rendering/binding.dart:450)
  #6      GestureBinding._handlePointerEventImmediately (package:flutter/src/gestures/binding.dart:426)
  #7      GestureBinding.handlePointerEvent (package:flutter/src/gestures/binding.dart:389)
  #8      GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:336)
  #9      GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:305)
  #10      _invoke1 (dart:ui/hooks.dart:328)
  #11      PlatformDispatcher._dispatchPointerDataPacket (dart:ui/platform_dispatcher.dart:442)
  #12      _dispatchPointerDataPacket (dart:ui/hooks.dart:262)