Hi!
I’ve looked up to see if I can re-create the issue, and I was able to find a possible cause, related to attachment exclusions.
If attachment search is not that important, as a temporary solution, you could turn Off the Search in attachments option on the General Options -> Attachment search panel, until the next plugin release.
If you want, you can also update your ticket with temporary log-in and FTP information, and I will debug through the code to see where the error originates from, and fix it if possible.