Corrupt files being processed by NZBDrone

I use NzbGet as download tool and when a releases is failed because of unrar/unpack failure NZBDrone still picks it up and processes it.
Is there something I should do to prevent this?

Status
HEALTH: 100% PAR: SUCCESS UNPACK: FAILURE

I believe there is a fix for this already, just hasn’t made it into develop/master yet.