Uncaught exception thrown in shutdown function.

PDOException: SQLSTATE[HY000]: General error: 1267 Illegal mix of collations (utf8_general_mysql500_ci,IMPLICIT) and (utf8_general_ci,IMPLICIT) for operation '=': SELECT t.word AS realword, i.word FROM {search_total} t LEFT JOIN {search_index} i ON t.word = i.word WHERE i.word IS NULL; Array ( ) in search_update_totals() (line 388 of /ftp1/webctft07/WWW/modules/search/search.module).