If a printer is specified for a terminal or location, but doesn't actually exist (i.e. isn't found by 'lpstat') it will be added by our tl-limit-printers script.
The problem is a logical error in the code that keeps such printers in a list, and then calls the following command on that printer:
> lpadmin -p <PRINTER> -u allow: <ALLOWED_USERS>
*** This bug has been marked as a duplicate of bug 5930 ***