Fatal error processing bounces when email_id IS NULL

I happened to look in the log & saw a bunch of errors like this

SELECT count(civicrm_mailing_event_bounce.id) as bounces,
civicrm_mailing_bounce_type.hold_threshold as threshold
FROM civicrm_mailing_event_bounce
INNER JOIN civicrm_mailing_bounce_type
ON civicrm_mailing_event_bounce.bounce_type_id = civicrm_mailing_bounce_type.id
INNER JOIN civicrm_mailing_event_queue
ON civicrm_mailing_event_bounce.event_queue_id = civicrm_mailing_event_queue.id
INNER JOIN civicrm_email
ON civicrm_mailing_event_queue.email_id = civicrm_email.id
WHERE civicrm_email.id =
AND (civicrm_email.reset_date IS NULL
OR civicrm_mailing_event_bounce.time_stamp >= civicrm_email.reset_date)
GROUP BY civicrm_mailing_event_bounce.bounce_type_id
ORDER BY threshold, bounces desc [nativecode=1064 ** 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 'AND (civicrm_email.reset_date IS NULL
OR civicrm_ma' at line 11]"

On checking civicrm_mailing_event_queue.email_id is an optional field and if you delete an email that you have sent a civimail to then it will null that field.

Once any one email in the mailing job has been nulled it is then impossible to process any more messages. This would potentially completely block bounce processing but unfortunately it is a silent failure (at least the way we are calling it)