Error You have an error in your SQL syntax, after update to v1.4.8

Hi,

Cron error:

Error You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '' at line 7 

SELECT order_id, order_date, request_items							FROM  jdf4sk_ywrr_email_schedule
WHERE	mail_status = 'pending' AND scheduled_date <= '2019-03-05 21:00:03'
ORDER BY id DESC
LIMIT		

Realized by do_action_ref_array, WP_Hook->do_action, WP_Hook->apply_filters, call_user_func_array, YWRR_Schedule->hourly_schedule
Array
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