Problems with artpath

After some time (and some updates) I used beets (now 1.4.3) again to edit some tags. So I run beet edit -a --all ... and make the changes. But saving them gives me the message:

artpath: None -> /home/myuser/None

The actual path is the current woking directory. Why is this?
And if I try to convert the album with beet convert -a ..., I get these errors:

convert: could not read image file: [Errno 2] No such file or directory: b’/home/myuser/None’

I think I missed some change in beets, or why is this behaviour?

Thanks a lot

Hmm; this really looks like a bug in the edit plugin! Would you mind filing an issue on GutHub with full details?

Thanks, @adrian. Done.