Is it possible for a hit to not have a referrer type/?
Hello,
I was going through a custom segment and noticed that one rule was "referrer type does not exist".

How is this possible? I thought the referrer type was set on the first hit in a visit and persisted throughout the visit (unless the visitor leaves and come back a through a different referrer type).
The custom segment I'm reviewing was created to track internal traffic sources.
Any help would be greatly appreciated, thank you!