[Bug Report] Cascader 级联选择器单选选择任意一级选项报错
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- Dominant language
- Vue
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- 54k
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Description
### Element UI version
2.15.14
### OS/Browsers version
谷歌版本 127.0.6533.72（正式版本）
### Vue version
2.7.16
### Reproduction Link
https://codepen.io/pen
### Steps to reproduce
选中某一单选都会报错
### What is Expected?
不报错
### What is actually happening?
选中某一单选都会报错
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