Getting error on "Buffer hits(fast) mode.

[trecords]

Hi,
I got this error when i use Buffer hits on wpmu:

"Unexpected output: FireStats error processing pending hits: Database
error: Illegal mix of collations (utf8_general_ci,COERCIBLE) and
(latin1_swedish_ci,IMPLICIT) for operation 'regexp'

MySQL Version: 5.0.85-community
SQL Query:
SELECT url,count(url_pattern) c FROM firestats_excluded_urls right
join (SELECT 'http://www.google.com/search?
q=vsayt.com&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-
US:official&client=firefox-a' AS url) urls ON url regexp url_pattern
GROUP BY url"

I find some old tickets about this but i still getting this error. I
use latest version of wpmu and firestats.

Thank you.