setting toolbox.feature.dataZoom.yAxisIndex = false,

[chen9091]

Version

5.0.1

Steps to reproduce

var option = {
                title: {
                    text: 'ECharts 入门示例'
                },
                trigger: 'axis',
                axisPointer: {
                    type: 'cross'
                },
                legend: {
                    data:['销量']
                },
                grid: {
                    left: '5%',
                    top: 120,
                    right: '5%',
                    bottom: 60
                },
                xAxis: {
                    data: ["衬衫","羊毛衫","雪纺衫","裤子","高跟鞋","袜子"]
                },
                toolbox: {
                    show: true,
                    feature: {
                        dataZoom: {
                            show:false,
                            yAxisIndex: false
                        },
                    }
                },
                yAxis: {},
                series: [{
                    name: '销量',
                    type: 'bar',
                    data: [5, 20, 36, 10, 10, 20]
                }]
            };

TypeError: Cannot read property 'unmount' of undefined

What is expected?

不报错，正常使用，

What is actually happening?

报错，echats图表不能正常使用

---

echarts4.9升到5.0.1，toolbox.feature.dataZoom.yAxisIndex = false ；报错

[echarts-bot[bot]]

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