spamassassin qmail problem

Looks like something is out of date in SpamAssassin… this is from /var/log/maillog:

Jun 27 20:59:25 host spamd[2726]: Can’t call method “string” on an undefined value at /usr/lib/pe
rl5/site_perl/5.8.5/Mail/SpamAssassin/DnsResolver.pm line 376.

Any idea which one is out of date, perl or SA?

Cliff.