Any ideas what this "Argument a" thing is?

p130:~> pkg_info | grep spam
spamassassin-3.1.0  Mail filter to identify spam
p130:~> uname -srm
NetBSD 3.0_RC2 i386


Martti


-------- Original Message --------
Subject: p130.mydomain.com 2005-11-22 18:00:00 system check
Date: Tue, 22 Nov 2005 18:00:52 +0200 (EET)
From: root@mydomain.com (Charlie Root)
To: root@mydomain.com


Unusual System Events
=-=-=-=-=-=-=-=-=-=-=
Nov 22 16:36:09 p130 spamd[795]: Argument "a" isn't numeric in pack at 
/usr/pkg/lib/perl5/vendor_perl/5.8.0/Mail/SpamAssassin/Util.pm line 711, 
<GEN968> line 79.
Nov 22 16:36:09 p130 spamd[795]: Argument "a" isn't numeric in pack at 
/usr/pkg/lib/perl5/vendor_perl/5.8.0/Mail/SpamAssassin/Util.pm line 711, 
<GEN968> line 79.
Nov 22 16:36:09 p130 spamd[795]: Argument "a" isn't numeric in pack at 
/usr/pkg/lib/perl5/vendor_perl/5.8.0/Mail/SpamAssassin/Util.pm line 711, 
<GEN968> line 79.
Nov 22 16:36:09 p130 spamd[795]: Argument "a" isn't numeric in pack at 
/usr/pkg/lib/perl5/vendor_perl/5.8.0/Mail/SpamAssassin/Util.pm line 711, 
<GEN968> line 79.
Nov 22 16:36:09 p130 spamd[795]: Argument "a" isn't numeric in pack at 
/usr/pkg/lib/perl5/vendor_perl/5.8.0/Mail/SpamAssassin/Util.pm line 711, 
<GEN968> line 79.
Nov 22 16:36:09 p130 spamd[795]: Argument "a" isn't numeric in pack at 
/usr/pkg/lib/perl5/vendor_perl/5.8.0/Mail/SpamAssassin/Util.pm line 711, 
<GEN968> line 79.
Nov 22 16:36:09 p130 spamd[795]: Argument "a" isn't numeric in pack at 
/usr/pkg/lib/perl5/vendor_perl/5.8.0/Mail/SpamAssassin/Util.pm line 711, 
<GEN968> line 79.
Nov 22 16:36:09 p130 spamd[795]: Argument "a" isn't numeric in pack at 
/usr/pkg/lib/perl5/vendor_perl/5.8.0/Mail/SpamAssassin/Util.pm line 711, 
<GEN968> line 79.
Nov 22 16:36:09 p130 spamd[795]: Argument "a" isn't numeric in pack at 
/usr/pkg/lib/perl5/vendor_perl/5.8.0/Mail/SpamAssassin/Util.pm line 711, 
<GEN968> line 79.
Nov 22 17:33:20 p130 spamd[590]: prefork: select returned error on server 
filehandle: