[squid-users] checked with nothing to match against!!

hello all
every time i take a look at logs i've got

root /usr/local/etc/squid # tail -f
/cache/cache.log
23:56
2010/04/24 23:54:57| SECURITY ERROR: ACL 0x28fe20a4 checked with nothing
to match against!!
2010/04/24 23:54:57| SECURITY ERROR: ACL 0x28fe20a4 checked with nothing
to match against!!
2010/04/24 23:54:57| SECURITY ERROR: ACL 0x28fe20a4 checked with nothing
to match against!!
2010/04/24 23:54:57| SECURITY ERROR: ACL 0x28fe20a4 checked with nothing
to match against!!
2010/04/24 23:54:58| SECURITY ERROR: ACL 0x28fe20a4 checked with nothing
to match against!!
2010/04/24 23:54:58| SECURITY ERROR: ACL 0x28fe20a4 checked with nothing
to match against!!
2010/04/24 23:54:58| SECURITY ERROR: ACL 0x28fe20a4 checked with nothing
to match against!!

what does this error means ? squid works but i don't like live with
errors )
thank you

P.S.
root /usr/local/etc/squid # uname
-a
23:56
FreeBSD mail.emoxam.ru 7.3-RELEASE FreeBSD 7.3-RELEASE #0: Fri Apr 2
00:53:43 MSD 2010 emoxam_at_mail.emoxam.ru:/usr/obj/usr/src/sys/CUSTOM731
i386
root /usr/local/etc/squid # pkg_version -v | grep
squid 23:56
squid-3.0.25 = up-to-date with port
root /usr/local/etc/squid
#
23:56
Received on Sun Apr 25 2010 - 08:17:21 MDT