diff --git a/src/main/java/org/gcube/datatransfer/resolver/catalogue/resource/CkanCatalogueConfigurationsReader.java b/src/main/java/org/gcube/datatransfer/resolver/catalogue/resource/CkanCatalogueConfigurationsReader.java
index 424ec14..f664242 100644
--- a/src/main/java/org/gcube/datatransfer/resolver/catalogue/resource/CkanCatalogueConfigurationsReader.java
+++ b/src/main/java/org/gcube/datatransfer/resolver/catalogue/resource/CkanCatalogueConfigurationsReader.java
@@ -52,7 +52,7 @@ public class CkanCatalogueConfigurationsReader {
 
 	
 	/**
-	 * Load catalogue end points.
+	 * Load catalogue end points through the ckan-util-library
 	 *
 	 * @return the gateway ckan catalogue reference
 	 * @throws Exception the exception
@@ -73,7 +73,7 @@ public class CkanCatalogueConfigurationsReader {
 		links.setPublicGatewayPortletURL(publicGatewayPortletURL);
 		
 		try{
-			
+			//If a catalogue gateway portlet URL is not provided/read from GR, building it
 			if(publicGatewayPortletURL==null || publicGatewayPortletURL.isEmpty()) {
 				//Building the gateway catalogue public URL from private VRE Portlet URL
 				URI toURL = new URI(privatePortletURL);
diff --git a/src/main/java/org/gcube/datatransfer/resolver/services/CatalogueResolver.java b/src/main/java/org/gcube/datatransfer/resolver/services/CatalogueResolver.java
index fa5ee7d..e31f6c9 100644
--- a/src/main/java/org/gcube/datatransfer/resolver/services/CatalogueResolver.java
+++ b/src/main/java/org/gcube/datatransfer/resolver/services/CatalogueResolver.java
@@ -225,7 +225,12 @@ public class CatalogueResolver {
 
 			String publicGatewayPorltetURL = String.format("%s?path=/%s/%s",ckanCatalogueReference.getPublicGatewayPortletURL(),entityContextValue, entityName);
 			String privateVREPortletURL = String.format("%s?path=/%s/%s",ckanCatalogueReference.getPrivateVREPortletURL(),entityContextValue, entityName);
-			String publicVREPortletURL = String.format("%s?path=/%s/%s",ckanCatalogueReference.getPublicVREPortletURL(),entityContextValue, entityName);
+			//Checking if the public VRE portlet URL is available (so it was read from GR)
+			String publicVREPortletURL = null;
+			if(ckanCatalogueReference.getPublicVREPortletURL()!=null && !ckanCatalogueReference.getPublicVREPortletURL().isEmpty()) {
+				//here the catalogue is available/deployed as public at VRE level
+				publicVREPortletURL = String.format("%s?path=/%s/%s",ckanCatalogueReference.getPublicVREPortletURL(),entityContextValue, entityName);
+			}
 			return new ItemCatalogueURLs(entityName, isPublicItem, privateVREPortletURL, publicVREPortletURL, publicGatewayPorltetURL);
 		}catch (Exception e) {
 			logger.error("Error when resolving CatalogueURL:", e);