From b396064005486666c16ea84f2855c46ca248ce2f Mon Sep 17 00:00:00 2001
From: John Kingsnorth <john@johnkingsnorth.co.uk>
Date: Mon, 19 Apr 2021 09:35:57 +0100
Subject: [PATCH] dev/core#2549 Fix undefined index when merging websites

---
 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 8c19989164..daab1a9d65 100644
--- a/CRM/Dedupe/Merger.php
+++ b/CRM/Dedupe/Merger.php
@@ -2409,7 +2409,7 @@ INNER JOIN  civicrm_membership membership2 ON membership1.membership_type_id = m
             ) {
               // Set this value as the default against the 'other' contact value
               $rows["move_location_{$blockName}_{$count}"]['main'] = $mainValueCheck[$blockInfo['displayField']];
-              $rows["move_location_{$blockName}_{$count}"]['main_is_primary'] = $mainValueCheck['is_primary'];
+              $rows["move_location_{$blockName}_{$count}"]['main_is_primary'] = $mainValueCheck['is_primary'] ?? 0;
               $rows["move_location_{$blockName}_{$count}"]['location_entity'] = $blockName;
               $mainContactBlockId = $mainValueCheck['id'];
               break;
-- 
2.25.1