wrong database name in error message?

I'm on 9.2.4 and I have several databases on the instance say db1, db2,
db2 etc.  Today I got this error message on connection of any of the
databases:
ERROR: database is not accepting commands to avoid wraparound data loss
in database "db1"
   Suggestion：Stop the postmaster and use a standalone backend to
vacuum that database.

The error messages says problem is on db1 when I connected to any database. But after I did vacuum full on some other
databasessuch as db2, db2, but not db1, the problem disappeared. 
Was that just a wrong database name in the error message?