From 6e0124fcbb5e95bf7400deeedf8df1ccfca478f1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Eike=20Martin=20L=C3=B6hden?=
 <eike.loehden@staff.uni-marburg.de>
Date: Wed, 15 Jan 2025 08:05:07 +0100
Subject: [PATCH] Add check to avoid adding empty array of values to an item.

---
 .../dspace/identifier/VersionedDOIIdentifierProvider.java    | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/dspace-api/src/main/java/org/dspace/identifier/VersionedDOIIdentifierProvider.java b/dspace-api/src/main/java/org/dspace/identifier/VersionedDOIIdentifierProvider.java
index b970c9f06c48..b011307e5a81 100644
--- a/dspace-api/src/main/java/org/dspace/identifier/VersionedDOIIdentifierProvider.java
+++ b/dspace-api/src/main/java/org/dspace/identifier/VersionedDOIIdentifierProvider.java
@@ -355,7 +355,10 @@ void removePreviousVersionDOIsOutOfObject(Context c, Item item, String oldDoi)
         if (changed) {
             try {
                 itemService.clearMetadata(c, item, MD_SCHEMA, DOI_ELEMENT, DOI_QUALIFIER, Item.ANY);
-                itemService.addMetadata(c, item, MD_SCHEMA, DOI_ELEMENT, DOI_QUALIFIER, null, newIdentifiers);
+                // Checks if Array newIdentifiers is empty to avoid adding null values to the metadata field.
+                if (!newIdentifiers.isEmpty()) {
+                    itemService.addMetadata(c, item, MD_SCHEMA, DOI_ELEMENT, DOI_QUALIFIER, null, newIdentifiers);
+                }
                 itemService.update(c, item);
             } catch (SQLException ex) {
                 throw new RuntimeException("A problem with the database connection occurred.", ex);