[Bug] 桑葚图鼠标经过图表浏览器控制台报错误

[springreport]

Version

2.0.0

Link to Minimal Reproduction

https://www.visactor.io/vchart/demo/sankey-chart/nameKey-sankey?version=2.0.0

Steps to Reproduce

https://www.visactor.io/vchart/demo/sankey-chart/nameKey-sankey?version=2.0.0 官网上的桑葚图使用2.0.0以后的版本数据经过桑葚图时浏览器控制台报错误，之前的版本没有问题，如下图：

Current Behavior

Expected Behavior

希望不报错误

Environment

- OS:
- Browser:
- Framework:

Any additional comments?

No response