Corrupted contacts in Contact program

I have at least one (maybe more) corrupted contacts in my Contacts program, which is preventing me from scanning contacts with Contacts Cleaner.

I have 12,400 contacts.

The scan goes very quickly until contact #1086, then slows to a crawl.

Is there some way to identify this record without scrolling forever? Then I can delete it.

Or is there another way to "clean" my Contacts data?