'package:flutter/src/gestures/tap.dart': Failed assertion: line 201 pos 14: '_down == null && _up == null': is not true

I am using gesture tap to close the article detail page, when I reopen the article detail page, the app will show this error(the first time open the detail works fine, the second time open the detail will show this error and the detail could not roll up and down):

======== Exception caught by gesture library =======================================================
The following assertion was thrown while dispatching a pointer event:
'package:flutter/src/gestures/tap.dart': Failed assertion: line 201 pos 14: '_down == null && _up == null': is not true.


Either the assertion indicates an error in the framework itself, or we should provide substantially more information in this error message to help you determine and fix the underlying cause.
In either case, please report this assertion by filing a bug on GitHub:
  https://github.com/flutter/flutter/issues/new?template=2_bug.md

When the exception was thrown, this was the stack: 
#2      BaseTapGestureRecognizer.addAllowedPointer (package:flutter/src/gestures/tap.dart:201:14)
#3      GestureRecognizer.addPointer (package:flutter/src/gestures/recognizer.dart:102:7)
#4      RawGestureDetectorState._handlePointerDown (package:flutter/src/widgets/gesture_detector.dart:1204:18)
#5      RenderPointerListener.handleEvent (package:flutter/src/rendering/proxy_box.dart:2821:29)
#6      GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:361:22)
...
Event: PointerDownEvent#6e7c4(position: Offset(191.4, 563.1))
  position: Offset(191.4, 563.1)
Target: RenderPointerListener#946e9 relayoutBoundary=up46
  parentData: <none> (can use size)
  constraints: BoxConstraints(0.0<=w<=363.4, 0.0<=h<=Infinity)
  size: Size(363.4, 458.2)
  behavior: deferToChild
  listeners: down
====================================================================================================

and this is my detail page flutter code:

    return GestureDetector(
          onHorizontalDragStart: _onHorizontalDragStart,
          onHorizontalDragUpdate: _onHorizontalDragUpdate,
          onHorizontalDragEnd: _onHorizontalDragEnd,
          child: Container(
            constraints: BoxConstraints(
              minHeight: MediaQuery.of(context).size.height * 0.9,
            ),
            color: Theme.of(context).scaffoldBackgroundColor,
            child: Padding(
              padding: const EdgeInsets.all(16.0),
              child: buildListView(item, context),
            ),
          ));


 void _onHorizontalDragStart(DragStartDetails details) {
    _initialSwipeOffset = details.globalPosition;
  }

  void _onHorizontalDragUpdate(DragUpdateDetails details) {
    _finalSwipeOffset = details.globalPosition;
  }

  void _onHorizontalDragEnd(DragEndDetails details) {
    if (_initialSwipeOffset != null) {
      final offsetDifference = _initialSwipeOffset!.dx - _finalSwipeOffset!.dx;
      if (offsetDifference < 0) {
        Navigator.pop(context);
      }
    }
  }

I am searching from internet but find no one encount this problem. what should I do to fix this problem?