From 978b982d3de8858ba6f9dbd1fbeef872107d3342 Mon Sep 17 00:00:00 2001
From: Jamie McClelland <jm@mayfirst.org>
Date: Fri, 14 Feb 2020 10:57:25 -0500
Subject: [PATCH] avoid error when merging record with null create date

https://lab.civicrm.org/dev/core/issues/1589
---
 CRM/Dedupe/Merger.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/CRM/Dedupe/Merger.php b/CRM/Dedupe/Merger.php
index 12ec5faaa5..c5f063d1df 100644
--- a/CRM/Dedupe/Merger.php
+++ b/CRM/Dedupe/Merger.php
@@ -1357,7 +1357,7 @@ INNER JOIN  civicrm_membership membership2 ON membership1.membership_type_id = m
       'id' => $otherId,
       'return' => ['created_date'],
     ])['created_date'];
-    if ($otherCreatedDate < $mainCreatedDate) {
+    if ($otherCreatedDate < $mainCreatedDate && !empty($otherCreatedDate)) {
       CRM_Core_DAO::executeQuery("UPDATE civicrm_contact SET created_date = %1 WHERE id = %2", [
         1 => [$otherCreatedDate, 'String'],
         2 => [$mainId, 'Positive'],
-- 
2.25.1