[KomadoriRobin]

Okey. One more try. This is the steps I've done this time.

A full reset of my Kobo
Transfered my books again
Reinstalled Nickelmenu
Excluded my Kobo from the Spotlight search on my Mac. I've had this recurring issue where the Kobo didn't get ejected due to it being used. Turns out Spotlight indexed it, which prevented it from being ejected. Since excluding it, I've not had this issue.

As of right now, it seems to be working without issues. I've ejected and connected it a bunch of times without issues. I'll do some more testing and get back with an update.

EDIT: And there it is again. "CorruptError: database disk image is malformed".