Sonarr crashes when attempting to process a release

[keno1964]

Sonarr version (exact version): 2.0.0.5322
Mono version (if Sonarr is not running on Windows):
OS: Win 7
Debug logs: https://pastebin.com/rMGTzanK
Description of issue:
Since yesterday, Sonarr has been unable to download anything. All of yesterday’s episodes are missed, and if I try to search auto or manual Sonarr will close/crash when it attempts to process any release.

Win 7________________________
Sonarr running locally (not as service)________________
Up to date (latest master)________________
No changes made to PC in at least the last month_____________

Since this log was taken, I have completely uninstalled Sonarr (manually removed all associated folders) reinstalled it and rebuilt the whole database, but the issue remains.
If I search for a missing episode, Sonarr will search, then start processing found releases. At a random point in the processing, it will stop and close.

[markus101]

Maybe something with this ridiculously small size?

19-7-3 06:20:50.3|Debug|AcceptableSizeSpecification|Item: Penn and Teller Fool Us S06E03 1080p WEB h264-TBS[rarbg], Size: -9223372036854775808 is smaller than minimum allowed size (259522560 bytes for 45min), rejecting.

Looks like it’s coming from Kat, I’d suggest disabling that indexer and see if the issue persists.

[keno1964]

You know… That almost has to be it.

I believe it has fixed itself, in a sense…

I manually downloaded yesterday’s episodes, and just checked and it has automagically downloaded one of today’s by itself!

This does beg a question though… How did that happen, and should it have been able to crash the app…