Notify letters DB Error

Query:
SELECT `tsu`.`name` AS `user_name`, `tsu`.`email` AS `user_email`, `tst`.`template_name` AS `template_name` FROM `sys_sbs_types` AS `tst` LEFT JOIN `sys_sbs_entries` AS `tse` ON `tst`.`id`=`tse`.`subscription_id` AND `tse`.`subscriber_type`='BX_DOL_SBS_TYPE_VISITOR' LEFT JOIN `sys_sbs_users` AS `tsu` ON `tse`.`subscriber_id`=`tsu`.`id` WHERE `tst`.`module_uri`='system' AND `tst`.`module_action`='mass_mailer'

Mysql error:
Unknown column 'tst.template_name' in 'field list'

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