Good point. The failure probably happens because the lookup is not possible, 
because the database that comes with mod_asn is not there.

I have to admit that I never was in that situation. "mb update" should handle 
that, though.

(To explain: the mb update command originally was meant to fill in only the AS and 
prefix data. Later, I extended it to also be able to fill in geographical 
coordinates, but didn't think about the dependency.)