The Webinar cron fails to run and produces the following error;

Processing module function webinar_cron ...!!! Error reading from database !!!
!! Unknown column 'f.reminderperiod' in 'field list'

SELECT
su.*,
f.course,
f.id as webinarid,
f.name as webinarname,
f.reminderperiod,
se.details
FROM
mdl_webinar_signups su
INNER JOIN
mdl_webinar_signups_status sus
ON su.id = sus.signupid
AND sus.superceded = 0
AND sus.statuscode = 70
JOIN
mdl_webinar_sessions se
ON su.sessionid = se.id
JOIN
mdl_webinar f
ON se.webinar = f.id
WHERE
su.mailedreminder = 0

[array (
)]
Error code: dmlreadexception !!
!! Stack trace: * line 407 of /lib/dml/moodle_database.php: dml_read_exception thrown

• line 966 of /lib/dml/mysqli_native_moodle_database.php: call to moodle_database->query_end()
• line 1574 of /mod/webinar/lib.php: call to mysqli_native_moodle_database->get_records_sql()
• line 725 of /mod/webinar/lib.php: call to webinar_get_unmailed_reminders()
• line 259 of /lib/cronlib.php: call to webinar_cron()
• line 88 of /admin/cron.php: call to cron_run()
  !!