Three finger screenshotting throws assert #20517
Description
Internal: b/143427192
On our released version of App, we were notified with an exception as the title show, the detail track infos are as follow:
NoSuchMethodError: The getter 'lastPosition' was called on null.
6 Receiver: null
7 Tried calling: lastPosition===>#0 PointerEventConverter.expand (package:flutter/src/gestures/converter.dart:246)
8 #1 _SyncIterator.moveNext (dart:core/runtime/libcore_patch.dart:151)
9 #2 ListQueue.addAll (dart:collection/queue.dart:715)
10 #3 _WidgetsFlutterBinding&BindingBase&GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:46)
11 #4 _rootRunUnary (dart:async/zone.dart:1136)
12 #5 _CustomZone.runUnary (dart:async/zone.dart:1029)
13 #6 _CustomZone.runUnaryGuarded (dart:async/zone.dart:931)
14 #7 _invoke1 (dart:ui/hooks.dart:144)
15 #8 _dispatchPointerDataPacket (dart:ui/hooks.dart:99)
That's the full exception stack, from where I cannot get any info where my code got wrong because it's all about the framework layer, and I'm not very familiar with this layer.I did not found anything invoke the function _dispatchPointerDataPacket in hooks.dart from my code.
This exception appeared only once by now.
Can we avoid this by checking if it's null before invoking lastPosition in converter.dart ?