Cannot read property 'isInline' of null

[agnieszkakowalska]

After updating from r20160624 to 20170710 we can see this js error after moving text element to the editor, double clicking it, and then click somewhere else in the content of editor (all languages). Please see below:
https://agnieszka.tinytake.com/sf/MTgwNTY5NF81ODc4Nzg5

[smiska]

Hi, this is a known issue in CKEditor (the third-party WYSIWYG editor). As far as we know it doesn't cause any functionality problems. In case you see something break related to this, please tell us and we'll take a look.

[agnieszkakowalska]

Thanks for the explanation. I also haven't noticed any functionality issues regarding this error yet, so we'll just ignore it.