Version

3.0.2

Reproduction link

https://github.com/germancasares/almanime-frontend/tree/feature/vue-3-issue

Steps to reproduce

npm install npm run serve

Change the theme on the moon icon on the navbar.

What is expected?

The theme changes to dark or light

What is actually happening?

The theme appears to change, but on the console an error shows up.

I was able to see that in runtime-core.esm-bundler.js:3852 on the oldVNode.el the el is null.

I don't remember what I was doing, since I rarely pay attention to the console.

When reporting a bug please provide a boiled down reproduction with only what is necessary to reproduce the bug (https://new-issue.vuejs.org/?repo=vuejs/vue#why-repro)

Open a new issue once you have a boiled down reproduction (eg no tests, no ts, no docker, etc)