Ok. I've had a look at this and luckily the exception
message is extremely clear and unambiguous; there is only
one line in the entire codebase where that exception could
possibly be raised.
Looks like iTunes is sending a nil (empty) track title on
your machine: something which no version of iTunes has ever
done on any operating system release, at least given the
information that I have available to me. So I've put a guard
in checking for that possibility and catching it.
So that will definitely fix the crash you're seeing. There
may be other cases where iTunes is passing something
unexpected, but we'll fix those if and when they arise. As
for why this is happening on your machine, no idea. Could be
something weird about your library. But the cause doesn't
matter; the important thing is that the issue is stopped
from causing a crash.
So this will be included in the next release, which I'll be
making available at some point in the next few days.