Only remove listener if it was originally added (#64)

Dimibe · Nov 20, 2020 · f9e3c2a · f9e3c2a
1 parent 041ffe7
commit f9e3c2a
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/lib/grouped_list.dart b/lib/grouped_list.dart
@@ -241,7 +241,9 @@ class _GroupedListViewState<T, E> extends State<GroupedListView<T, E>> {
 
  @override
  void dispose() {
- _controller.removeListener(_scrollListener);
+ if (widget.useStickyGroupSeparators) {
+ _controller.removeListener(_scrollListener);
+ }
  if (widget.controller == null) {
  _controller.dispose();
  }