Range picker Cannot read property 'isSame' of undefined

[connected]

• I have searched the issues of this repository and believe that this is not a duplicate.

Version

2.1.4

Environment

Chrome 90

Reproduction link

https://2x.antdv.com/components/date-picker/#DatePicker

Steps to reproduce

1. Open range picker with presets in the footer
2. Select first date using mouse
3. Hover one of the presets in the footer
4. Hover back on calendar panel and try to select second date using keyboard arrows

What is expected?

No exception should be fired

What is actually happening?

"TypeError: Cannot read property 'isSame' of undefined" exception is fired and visible in dev-tools Console

---

This issue is reproducible on the ant-design-vue v1 and v2 doc. pages.