The getter 'width' was called on null about reorderables HOT 8 CLOSED

I found a workaround : just assign a new ScrollController to the scrollController parameter :
ReorderableColumn( scrollController: ScrollController() )

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@hanshengchiu Still happening on 56578ad even after #48

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Unfortunately I will not take the time to make a pull request, if that's what you were waiting for, I'll wait for your bugfix.
Thanks 😉

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@Nico04 Thank you for explaining this. Waiting for the pull request to get merged

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I've got the same issue (with ReorderableColumn) with a more complexe project, but I found out that it occurs only when there are other scroll widget in the tree.
Weither it's a ListView, a SingleChildScrollView...

I've edited the end of your ColumnExample2 to help you fix this issue :

return Material(
      child: Card(
        child: Column(
          children: <Widget>[
            reorderableColumn,
            SingleChildScrollView(
              child: Text('r'),
            )
          ],
        )
      ),
      elevation: 6.0,
      color: Colors.transparent,
      borderRadius: BorderRadius.zero,
    );

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I've juste realized that the same error (ScrollController attached to multiple scroll views) happens in the same way with Flutter/ReorderableListView.

This may help you resolve it
flutter/flutter#31666

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This error occured again on a new project, but this time in the 3 levels deep nested list.
My workaround works fine for level 2.
Without the workaround, it doesn't work at all on level 3, and with it it works most of the time for in some undefined cases it crash again...
Any clues ?

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I found a workaround : just assign a new ScrollController to the scrollController parameter :
ReorderableColumn( scrollController: ScrollController() )

thanks this works for me

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