do not send invitation if completed

app/jobs/send_submitter_invitation_email_job.rb

@@ -6,6 +6,7 @@ class SendSubmitterInvitationEmailJob
   def perform(params = {})
     submitter = Submitter.find(params['submitter_id'])
 
+    return if submitter.completed_at?
     return if submitter.submission.source == 'invite' && !Accounts.can_send_emails?(submitter.account, on_events: true)
 
     unless Accounts.can_send_invitation_emails?(submitter.account)