Duplicate entry error when sending emails to multiple addresses from the same contact

When sending an email to multiple addresses of a single contact through contact activity, an error is displayed, but does not impact the sending of mail.

INSERT INTO civicrm_activity_target (activity_id , target_contact_id ) VALUES ( 9 , 233 ) [nativecode=1062 ** Duplicate entry '233-9' for key 'UI_activity_target_contact_id']

A crude fix may just be to simply make these statements INSERT IGNORE