"Server error: Entry not found in index" when switching between view all / view unread

Subject: Server entry not found in index

We upgraded our Domino servers to version 8.51 and the clients are also running on 8.51. Users get the Server Entry Not Found in Index when they view unread documents.

Any ideas?

Subject: All documents view generates the error here

We also upgraded our Domino servers to version 8.51 and the clients are also running on 8.51.

Some users get the Server Entry Not Found in Index when they open the “All documents” view.

I hoped I would fine an answer here, but it looks like I only found more questions