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fix error when closing a page with scrollable content #12

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fix error when closing a page with scrollable content #12

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6 changes: 4 additions & 2 deletions lib/widgets/round_scrollbar.dart
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Original file line number Diff line number Diff line change
@@ -1,7 +1,7 @@
import 'dart:async';
import 'dart:math' as math;

import 'package:flutter/material.dart';
import 'dart:math' as math;

// Defines the starting point of the progress bar arc on the screen.
// This is equivalent to the 2 o'clock position on an analog clock.
Expand Down Expand Up @@ -169,7 +169,9 @@ class _RoundScrollbarState extends State<RoundScrollbar>
_fadeOutTimer?.cancel();
if (!widget.autoHide) return;
_fadeOutTimer = Timer(widget.autoHideDuration, () {
_opacityController.reverse();
if (mounted) {
_opacityController.reverse();
}
_fadeOutTimer = null;
});
}
Expand Down