Apparently introduce in a recent upgrade to cache text, notices are appearing everywhere.
A couple of notes:
1. Notices might be harmless, but since they must be investigated before installing on a production server, it would be good if they were checked for.
2. The FULLME constant is similar to the $FULLME global variable, so it takes some time to figure out what is going on. And the meaning of using the term FULLME is not obvious (to me
The patch checks for the existence of the constant before checking it's value as in other places where the constant is used.