From 00e911271ae9e65f1a1ca593de142c898b9b5b49 Mon Sep 17 00:00:00 2001
From: Chris MacDonald <31731869+chrismacdonaldw@users.noreply.github.com>
Date: Wed, 1 Nov 2023 16:29:47 -0300
Subject: [PATCH] Check for non-null entity

---
 src/Plugin/OaiMetadataMap/DgiStandard.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Plugin/OaiMetadataMap/DgiStandard.php b/src/Plugin/OaiMetadataMap/DgiStandard.php
index 04fe8e7..3c43fc0 100644
--- a/src/Plugin/OaiMetadataMap/DgiStandard.php
+++ b/src/Plugin/OaiMetadataMap/DgiStandard.php
@@ -353,7 +353,7 @@ protected function addValues(FieldItemListInterface $items, $metadata_field) {
   protected function addLinkedAgentValues(EntityReferenceFieldItemListInterface $items) {
     foreach ($items as $item) {
       $metadata_field = $this->getLinkedAgentMetadataField($item->getValue()['rel_type']);
-      if ($metadata_field) {
+      if ($metadata_field && $item->entity) {
         $this->elements[$metadata_field][] = $item->entity->label();
       }
     }