[DanCooper]

When I am trying to remove episode from TV show and press delete I get this

http://postimg.org/image/3r4eraraj/

and Ember shuts down. Maybe because I deleted NFO file from explorer not through Ember? How can I remove episode when there is no NFO file?

With delete :-)
No, sounds like a bug. It's nothing needed as local file to remove a database entry in Ember. "ShowID = -1" sounds like the entry has no been linked to a tv show or the was something wrong while loading the episode entry.