Errors in the console when using on JSFiddle

[szymonkups]

Is this a bug report or feature request? (choose one)

🐞 Bug report

💻 Version of CKEditor

1.0.0-beta.1

📋 Steps to reproduce

1. Open https://jsfiddle.net/szymonkups/pr7e2oLb/, make sure console is open.
2. Press enter inside editor contents.

✅ Expected result

No errors shown.

❎ Actual result

Error displayed:

Uncaught TypeError: Cannot read property 'parentNode' of null
    at it (scroll.js:265)
    at Je (scroll.js:49)
    at Vm.scrollToTheSelection (view.js:265)
    at yc.listenTo (enter.js:41)
    at yc.fire (emittermixin.js:195)
    at yc.Uf.t.on (enterobserver.js:31)
    at yc.fire (emittermixin.js:195)
    at hm.fire (domeventobserver.js:96)
    at hm.onDomEvent (keyobserver.js:28)
    at Kc.listenTo (domeventobserver.js:81)

📃 Other details that might be useful

JSFiddle is inserting contents inside iframe - this might be connected.

[oleq]

JSFiddle is inserting contents inside iframe - this might be connected.

It's definitely about the iframes.

Edit: I created a local demo of ClassicEditor running inside an iframe. And it works without errors. So there's more to it than I expected.

[Reinmar]

There's a chance that ckeditor/ckeditor5-utils#240 fixes this issue. It also describes it more precisely.

[Reinmar]

Encountered it on https://jsfiddle.net/adsvfnn0/.

We should fix this ASAP because it looks very bad and makes it impossible to create valuable JSFiddles.

[oleq]

I found the root of the issue and proposed the fix in ckeditor/ckeditor5-utils#242 based on the initial contributor's PR.