Version

3.0.11

Reproduction link

https://codesandbox.io/s/dazzling-snyder-kzsxf?file=/src/App.vue

Steps to reproduce

See codesandbox for details，when click delate button，will cause Uncaught (in promise) TypeError: Cannot read property 'type' of null.

What is expected?

Normal work, no error will be reported

What is actually happening?

runtime-core.esm-bundler.js?5c40:4818 Uncaught (in promise) TypeError: Cannot read property 'type' of null
    at unmountComponent (runtime-core.esm-bundler.js?5c40:4818)
    at unmount (runtime-core.esm-bundler.js?5c40:4736)
    at unmountChildren (runtime-core.esm-bundler.js?5c40:4864)
    at unmount (runtime-core.esm-bundler.js?5c40:4754)
    at patch (runtime-core.esm-bundler.js?5c40:3760)
    at patchBlockChildren (runtime-core.esm-bundler.js?5c40:4091)
    at processFragment (runtime-core.esm-bundler.js?5c40:4152)
    at patch (runtime-core.esm-bundler.js?5c40:3784)
    at componentEffect (runtime-core.esm-bundler.js?5c40:4368)
    at reactiveEffect (reactivity.esm-bundler.js?a1e9:42)