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Database error in vBulletin 3.7.4:

Invalid SQL:

		SELECT prefix.*, prefixpermission.usergroupid AS restriction
		FROM prefix AS prefix
		LEFT JOIN prefixpermission AS prefixpermission ON (prefix.prefixid = prefixpermission.prefixid)
		ORDER BY prefix.displayorder;

MySQL Error   : Illegal mix of collations (latin1_swedish_ci,IMPLICIT) and (latin1_general_ci,IMPLICIT) for operation '='
Error Number  : 1267
Request Date  : Sunday, January 4th 2009 @ 12:05:48 AM
Error Date    : Sunday, January 4th 2009 @ 12:05:48 AM
Script        : http://www.xxxx.com/install/upgrade_380a2.php?step=5
Referrer      : http://www.xxx.com/install/upgrade_380a2.php?step=4
IP Address    : xxxxxxxxx
Username      : 
Classname     : vB_Database
MySQL Version : 5.0.67-community