From f1134501a5af6839c295f520e78613e1f0769f13 Mon Sep 17 00:00:00 2001
From: mark burdett <mfburdett@gmail.com>
Date: Fri, 8 Jun 2018 16:49:03 -0700
Subject: [PATCH] the SMTP response code could be empty string

---
 CRM/Mailing/BAO/MailingJob.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/CRM/Mailing/BAO/MailingJob.php b/CRM/Mailing/BAO/MailingJob.php
index a63dabbac9..cbf5661db5 100644
--- a/CRM/Mailing/BAO/MailingJob.php
+++ b/CRM/Mailing/BAO/MailingJob.php
@@ -804,7 +804,7 @@ VALUES (%1, %2, %3, %4, %5, %6, %7)
     }
 
     // Register 5xx SMTP response code (permanent failure) as bounce.
-    if ($code{0} === '5') {
+    if (isset($code{0}) && $code{0} === '5') {
       return FALSE;
     }
 
-- 
2.25.1