Crash when using link UI and/or table toolbar and/or table selection

[oleq]

📝 Provide detailed reproduction steps (if any)

I managed to crash the editor 3 times but I cannot find any reliable reproduction path (a.k.a. bugfoot). Some steps that repeated each time:

1. Build docs and open http://fake.ckeditor.com/ck/5/ckeditor5/build/docs/ckeditor5/latest/examples/builds/document-editor.html.
2. Putting selection in the cell.
3. Using the mouse to trigger the link insertion UI.
4. Scrolling using the mouse scroll button.
5. Putting the selection back into the cell or selecting table as a whole.

Well... check out the screencast in another issue to get the gist of what I did.

✔️ Expected result

No crash

❌ Actual result

📃 Other details

• Browser: Chrome
• OS: Mac
• CKEditor version: master

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[mlewand]

Plain text error message for better search: Uncaught TypeError: Cannot read property 'values' of undefined

[CKEditorBot]

There has been no activity on this issue for the past year. We've marked it as stale and will close it in 30 days. We understand it may still be relevant, so if you're interested in the solution, leave a comment or reaction under this issue.

[CKEditorBot]

We've closed your issue due to inactivity over the last year. We understand that the issue may still be relevant. If so, feel free to open a new one (and link this issue to it).