Query reeking havoc on server

[dfc005]

Hey guys,

Looking for some urgent help if possible, we have one query which is continually causing our mysql server to crash. Any ideas where this query comes from?

SELECT
	userfield.*, usertextfield.*, user.*, UNIX_TIMESTAMP(passworddate) AS passworddate, user.languageid AS saved_languageid,
    IF(displaygroupid=0, user.usergroupid, displaygroupid) AS displaygroupid,
    language.phrasegroup_global AS phrasegroup_global,
    language.options AS lang_options,
    language.languagecode AS lang_code,
    language.charset AS lang_charset,
    language.locale AS lang_locale,
    language.imagesoverride AS lang_imagesoverride,
    language.dateoverride AS lang_dateoverride,
    language.timeoverride AS lang_timeoverride,
    language.registereddateoverride AS lang_registereddateoverride,
    language.calformat1override AS lang_calformat1override,
    language.calformat2override AS lang_calformat2override,
    language.logdateoverride AS lang_logdateoverride,
    language.decimalsep AS lang_decimalsep,
    language.thousandsep AS lang_thousandsep
FROM user AS user
LEFT JOIN userfield AS userfield ON (user.userid = userfield.userid)
LEFT JOIN usertextfield AS usertextfield ON (usertextfield.userid = user.userid) LEFT JOIN language AS language ON (language.languageid = IF(user.languageid = 0, 1, user.languageid))
WHERE user.userid = 1234