And of course, if you end up making any changes, making a backup first is always a good idea:
Keep in mind however that this query primarily finds issues with archival descriptions, while the error message suggests that the problem may be associated with an Archival Institution (i.e. a repository record).
Have you tried running any of the common maintenance tasks, particluarly those listed on the Troubleshooting documentation page? For example: rebuilding the nested set, generating slugs, clearing the application cache, restarting PHP-FPM... these are all good things to try, as they can resolve many common issues.
Does your instance have many repository records? Perhaps you could do some manual review of them, to look for issues. If there are translations, are they entered on the right template, and is culture fallback working as expected? Do you see any cases with strange characters that might not be UTF-8? What happens if you try adding all the repository records to the clipboard and attempting a CSV export?
If you are still having issues, please be sure to send us more information as well, such as: