Highlight on invalid reference

[Moooongo]

An invalid reference like [NO_PRINTED_FORM] prevents addition of new entries after this point. The citation manager can still retrieve from and search in Zotero properly, but clicking on a search result when adding new entries simply closes the search window without adding anything to the markdown cell until the invalid reference is removed. It would be a nice feature to highlight the invalid reference in question.

[krassowski]

How did you create the invalid reference?

[Moooongo]

I copied a large body of text, containing references, between different notebooks. I think the same reference in different files has a different id, and this caused the invalid reference. A part of the symptom is that the GUI loading bar is stuck until the invalid reference is removed.