Nested menu exception TypeError: "child.componentOptions is undefined"

[LeoQuote]

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

Version

1.3.10

Environment

Firefox 68.0 vue 2.5.17

Reproduction link

Steps to reproduce

I created a nested menu using the code given by document https://vue.ant.design/components/menu/#Single-file-recursive-menu
but it seems not working

What is expected?

A menu shows

What is actually happening?

nothing shows
exception: TypeError: "child.componentOptions is undefined"

---

I deleted the "key" in the menu list , using the name as key. I think it would be fine for vue
I added "key" property for each item , but the expecetion is still there.

[LeoQuote]

Could be associated with #604

[sendya]

import SubMenu from '' not import { SubMenu } from ''

[LeoQuote]

resolved with the solution above

[hsl727261250]

解决方法无效.

[github-actions]

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