1. On a Flow board topic create a link.
2. Open the link via link inspector - and delete the link entirely. Do not press 'Save' or anything.
3. After clearing a link in the link inspector field, click on 'Save changes' - 'Uncaught TypeError: Cannot read property 'ownerDocument' of undefined' is displayed.

After clearing the link in the link inspector, click on 'Save changes'

'Save changes' becomes inactive, 'Cancel' in the link inspector does not work.