Version

3.0.0

Reproduction link

https://codesandbox.io/s/uncaught-in-promise-typeerror-cannot-read-property-type-of-null-i3fr1

Steps to reproduce

Delete the last piece of data

What is expected?

Component unloads normally after data is deleted

What is actually happening?

runtime-core.esm-bundler.js?5c40:4729 Uncaught (in promise) TypeError: Cannot read property 'type' of null

Duplicate of https://github.com/vuejs/vue-next/issues/3610