From 7b715b2bb8153c47a679d7af9d25cc7db52efbb4 Mon Sep 17 00:00:00 2001
From: "miriam.baglioni" <miriam.baglioni@isti.cnr.it>
Date: Mon, 4 Mar 2024 08:45:29 +0100
Subject: [PATCH] -

---
 .../dnetlib/dhp/oa/graph/dump/skgif/DumpResult.java  | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/dump/src/main/java/eu/dnetlib/dhp/oa/graph/dump/skgif/DumpResult.java b/dump/src/main/java/eu/dnetlib/dhp/oa/graph/dump/skgif/DumpResult.java
index e02bbe2..1e8d465 100644
--- a/dump/src/main/java/eu/dnetlib/dhp/oa/graph/dump/skgif/DumpResult.java
+++ b/dump/src/main/java/eu/dnetlib/dhp/oa/graph/dump/skgif/DumpResult.java
@@ -199,18 +199,18 @@ public class DumpResult implements Serializable {
 					manifestation.setAccess_right(AccessRight.UNAVAILABLE.label);
 
 			}
+
 		manifestation
 			.setLicence(
 				Optional
 					.ofNullable(epm.getInstance().getLicense())
 					.map(value -> value.getValue())
 					.orElse(null));
-		manifestation
-			.setUrl(
-				Optional
-					.ofNullable(epm.getInstance().getUrl())
-					.map(value -> value.get(0))
-					.orElse(null));
+		if(Optional.ofNullable(epm.getInstance().getUrl()).isPresent() && epm.getInstance().getUrl().size() > 0)
+			manifestation
+				.setUrl(epm.getInstance().getUrl().get(0));
+		else
+			manifestation.setUrl(null);
 
 		if (Optional.ofNullable(epm.getInstance().getPid()).isPresent() && epm.getInstance().getPid().size() > 0) {
 			manifestation.setPid(epm.getInstance().getPid().get(0).getValue());