[Bug Report][2.5.3] v-navigation-drawer with expand-on-hover throws console errors when hovered

Environment

Vuetify Version: 2.5.3 Last working version: 2.4.11 Vue Version: 2.6.11 Browsers: Chrome 91.0.4472.77 OS: Mac OS 10.14.6

Steps to reproduce

Use v-navigation-drawer with expand-on-hover and mini-variant

Expected Behavior

Navigation drawer expands and contracts

Actual Behavior

Navigation drawer expands and contracts but throws the following console error

index.js:245 Uncaught TypeError: Failed to execute 'getComputedStyle' on 'Window': parameter 1 is not of type 'Element'.
    at VueComponent.checkActivatorFixed (index.js:245)
    at VueComponent.updateDimensions (index.js:338)

in packages/vuetify/src/mixins/menuable/index.ts

Reproduction Link

https://codepen.io/kotoriii/pen/zYZWyXB

Other comments

The Codepen I linked does not reproduce the issue, even though I tried using as many components as I’m currently using. It’s hard to reproduce my local stack, but error is caused by these added lines in beforeMount() and beforeDestroy() in this PR’s recent file changes: https://github.com/vuetifyjs/vuetify/pull/13670/files#diff-a510753fb8a85de8db6181b6c250d80bcccbf5fa2d4a97e5660e233bfc718200R193

[Tofandel]

From your description it just looks like it’s coming from https://github.com/vuetifyjs/vuetify/blob/ec8fafa9e785f6817bf6d0058a6953b0091a1370/packages/vuetify/src/mixins/menuable/index.ts#L287

But doesn’t directly looks related to the PR

It would be nice to know exactly what is the value of el when it throws this error, can you put a breakpoint on this line and check in the browser debugger what’s the value of el before it throws the error?

Because it should only be able to be an Element, a falsy value would step out of the loop, so my guess is one component is returning something from getActivator that is not an HTMLElement but evaluates truthy, maybe a string or similar, but typescript should in that case catch this

Do you by chance extend some mixins directly, or have some custom components extending the vuetify components or similar?

[KaelWD]

I don’t think that’s what’s causing it, it wouldn’t have got to the debugger line. Try enabling “pause on exceptions” in the top right and see what the element that causes the error is. You could also add console.log(el) above line 245 to list all the traversed elements.