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onTap error on dataSource is empty

Empty



series: <ChartSeries<Map<String, dynamic>, String>>[
      ColumnSeries<Map<String, dynamic>, String>(
        dataSource: dataSource,
        xValueMapper: (Map<String, dynamic> data, _) =>
            WeekUtils.getWeek(data['week']),
        yValueMapper: (Map<String, dynamic> data, _) =>
            IntlUtils.tryToNum(data['negSaleAmt']),
        name: '销售额',
        dataLabelSettings: const DataLabelSettings(
          isVisible: true,
          showZeroValue: false,
        ),
        // isVisible: dataSource?.isNotEmpty == true, // 
If I uncomment, no error will be reported

      ),
      LineSeries<Map<String, dynamic>, String>(
        dataSource: dataSource,
        xValueMapper: (data, _) => WeekUtils.getWeek(data['week']),
        yValueMapper: (data, _) =>
            IntlUtils.tryToNum(data['negSaleAmtRatio']) ?? 0,
        name: '销售额占比',
        markerSettings: const MarkerSettings(isVisible: true),
        dataLabelSettings: const DataLabelSettings(isVisible: true),
        yAxisName: 'cvAxis',
        // isVisible: dataSource?.isNotEmpty == true, // 
If I uncomment, no error will be reported

      ),
    ],

if