JavaScript error for oh-label-card with trendItem and stylesheet

Setup, Configuration and Use Beginners
,
1

openHAB 3.2.

When I use an oh-label-card with trendItem AND custom stylesheet, then I get a JavaScript error on rendering.

Chrome:

TypeError: Cannot read properties of undefined (reading 'add')
    at i.mounted (app.js:1:50713)
    at qe (app.js:7:11332)
    at tn (app.js:7:25247)
    at Object.insert (app.js:7:20269)
    at O (app.js:7:60117)
    at i.__patch__ (app.js:7:61517)
    at e._update (app.js:7:34352)
    at i.a (app.js:7:68180)
    at fn.get (app.js:7:26678)
    at fn.run (app.js:7:27562)

Firefox:

TypeError: this.$el.classList is undefined
    mounted http://backend:8090/js/app.js:1
    qe http://backend:8090/js/app.js:7
    tn http://backend:8090/js/app.js:7
    insert http://backend:8090/js/app.js:7
    O http://backend:8090/js/app.js:7
    Ho http://backend:8090/js/app.js:7
    _update http://backend:8090/js/app.js:7
    a http://backend:8090/js/app.js:7
    get http://backend:8090/js/app.js:7
    run http://backend:8090/js/app.js:7
    pn http://backend:8090/js/app.js:7
    at http://backend:8090/js/app.js:7
    Ze http://backend:8090/js/app.js:7
    promise callback*Ye http://backend:8090/js/app.js:7
    at http://backend:8090/js/app.js:7
    update http://backend:8090/js/app.js:7
    update http://backend:8090/js/app.js:7
    notify http://backend:8090/js/app.js:7
    set http://backend:8090/js/app.js:7
    set http://backend:8090/js/app.js:7
    onWindowResize http://backend:8090/js/13.app.js:3
    mounted http://backend:8090/js/13.app.js:3
    at http://backend:8090/js/app.js:7
    Ze http://backend:8090/js/app.js:7
    promise callback*Ye http://backend:8090/js/app.js:7
    at http://backend:8090/js/app.js:7
    $nextTick http://backend:8090/js/app.js:7
    mounted http://backend:8090/js/13.app.js:3
    at http://backend:8090/js/app.js:7
    Ze http://backend:8090/js/app.js:7
    promise callback*Ye http://backend:8090/js/app.js:7
    at http://backend:8090/js/app.js:7
    $nextTick http://backend:8090/js/app.js:7
    mounted http://backend:8090/js/13.app.js:3
    qe http://backend:8090/js/app.js:7
    tn http://backend:8090/js/app.js:7
    insert http://backend:8090/js/app.js:7
    O http://backend:8090/js/app.js:7
    Ho http://backend:8090/js/app.js:7
    _update http://backend:8090/js/app.js:7
    a http://backend:8090/js/app.js:7
    get http://backend:8090/js/app.js:7
    run http://backend:8090/js/app.js:7
    pn http://backend:8090/js/app.js:7
    at http://backend:8090/js/app.js:7
    Ze http://backend:8090/js/app.js:7
    promise callback*Ye http://backend:8090/js/app.js:7
    at http://backend:8090/js/app.js:7
    update http://backend:8090/js/app.js:7
    update http://backend:8090/js/app.js:7
    $forceUpdate http://backend:8090/js/app.js:7
    d http://backend:8090/js/app.js:7
    p http://backend:8090/js/app.js:7
    L http://backend:8090/js/app.js:7
    promise callback*Nt/e< http://backend:8090/js/app.js:7
    Nt http://backend:8090/js/app.js:7
    Ft http://backend:8090/js/app.js:7
    Ft http://backend:8090/js/app.js:7
    _c http://backend:8090/js/app.js:7
    d http://backend:8090/js/app.js:7
    _render http://backend:8090/js/app.js:7
    a http://backend:8090/js/app.js:7
    get http://backend:8090/js/app.js:7
    fn http://backend:8090/js/app.js:7
    mount http://backend:8090/js/app.js:7
    $mount http://backend:8090/js/app.js:7
    $mount http://backend:8090/js/app.js:7
    init http://backend:8090/js/app.js:7
    d http://backend:8090/js/app.js:7
    d http://backend:8090/js/app.js:7
    f http://backend:8090/js/app.js:7
    d http://backend:8090/js/app.js:7
    Ho http://backend:8090/js/app.js:7
    _update http://backend:8090/js/app.js:7
    a http://backend:8090/js/app.js:7
    get http://backend:8090/js/app.js:7
    fn http://backend:8090/js/app.js:7
    mount http://backend:8090/js/app.js:7
    $mount http://backend:8090/js/app.js:7
    $mount http://backend:8090/js/app.js:7
    init http://backend:8090/js/app.js:7
    d http://backend:8090/js/app.js:7
    d http://backend:8090/js/app.js:7
    S http://backend:8090/js/app.js:7

Code for oh-label-card on page

component: oh-label-card
config:
  item: CO2
  title: OH Label Card
  trendItem: CO2
  stylesheet: |
    .abc {
      padding: 1px;
    }
slots: null

If I remove the inline stylesheet for the oh-label-card, the error is gone. Same for removing the trendItem.
So, I get the error if I have trendItem set AND stylesheet. The content of the stylesheet does not matter.
The widget is looking OK though.

2

Might want to put this through as an issue on GitHub.

3