is it a bug ?

Hello,
When selecting (from php) using this select :

SELECT msgid,content,timecreated,soa FROM sms_mo WHERE (LOWER(content)
LIKE 'club%') AND (da='87000') AND (timecreated > '2005-02-18
17:00:00') ORDER BY msgid ASC

I get this error :
PANIQUE: ERRORDATA_STACK_SIZE exceeded server closed the connection
unexpectedly This probably means the server terminated abnormally
before or while processing the request.

when applying that select into phppgadmin interface there's no error.
but when commenting the line :
#client_encoding = LATIN9

in /var/lib/pgsql/data/postgresql.conf i will no longer have an
error... but got problems with charsets (i use frensh accents and arab
characters)