PDOException: SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry 'date_temporary_timezone' for key 1: INSERT INTO {variable} (name, value) VALUES (:db_insert_placeholder_0, :db_insert_placeholder_1); Array ( [:db_insert_placeholder_0] => date_temporary_timezone [:db_insert_placeholder_1] => i:0; ) in variable_set() (line 999 of /***/www/includes/bootstrap.inc).

Что делать?