Flutter: RenderFlex overflow when using column

I'm getting a renderflex overflow error which displays as the following:

It's coming from the following code:

                  return Column(
                      children: [
                        DropdownButton<String>(
                            items: Utils.ddsDropdown
                                .map<DropdownMenuItem<String>>((String value) {
                              return DropdownMenuItem<String>(
                                value: value,
                                child: Text(value),
                              );
                            }).toList(),
                            onChanged: (value) {}),
                        ListView.builder(
                          shrinkWrap: true,
                          padding: const EdgeInsets.fromLTRB(0, 16, 0, 16),
                          itemCount: card.length,
                          itemBuilder: (context, index) {
                            return MyCard.buildCard(card[index], context);
                          },
                        )
                      ],
                    )

I also tried to wrap the column in an Expanded widget and in a SingleChildScrollView but still got the same error. I think the column is preventing the page from being fully scrollable. But I need the column to be able to have the DropdownButton and ListView.

I even tried wrapping the entire widget in a SingleChildScrollView as follows:

        Widget build(BuildContext context) => SingleChildScrollView(
          child: FutureBuilder<List<Map<String, dynamic>>>(
        future: MyCard.getData(widget.categoryIndex, widget.subCategories)!
            .whenComplete(() => setState(() {
                  isLoading = false;
                })),
        builder: ((context, snapshot) {
          if (snapshot.hasData && snapshot.data!.isNotEmpty) {
            return FutureBuilder<List<MyCard>>(
                future: MyCard.readData(snapshot.data),
                builder: (context, cards) {
                  if (cards.hasData) {
                    final card = cards.data!;
                    return Column(
                      children: [
                        //Text("Hello"),
                        DropdownButton<String>(
                            items: Utils.ddsDropdown
                                .map<DropdownMenuItem<String>>((String value) {
                              return DropdownMenuItem<String>(
                                value: value,
                                child: Text(value),
                              );
                            }).toList(),
                            onChanged: (value) {}),
                        ListView.builder(
                          shrinkWrap: true,
                          padding: const EdgeInsets.fromLTRB(0, 16, 0, 16),
                          itemCount: card.length,
                          itemBuilder: (context, index) {
                            return MyCard.buildCard(card[index], context);
                          },
                        )
                      ],
                    );
                  } else {
                    return const Text("No data");
                  }
                });
          } else {
            return isLoading
                ? Column(
                    children: const [CircularProgressIndicator()],
                  )
                : const Text("You do not have any workouts yet");
          }
        }),
      ));

but it still overflows.

Wrap only the ListView in Expanded as follows:

Column(
  children: [
    DropdownButton<String>(
    ...
    Expanded(
      child: ListView.builder(
...

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