diff --git a/src/main/java/org/gcube/informationsystem/resourceregistry/publisher/ResourceRegistryPublisherImpl.java b/src/main/java/org/gcube/informationsystem/resourceregistry/publisher/ResourceRegistryPublisherImpl.java
index 0e77fdc..4b3e086 100644
--- a/src/main/java/org/gcube/informationsystem/resourceregistry/publisher/ResourceRegistryPublisherImpl.java
+++ b/src/main/java/org/gcube/informationsystem/resourceregistry/publisher/ResourceRegistryPublisherImpl.java
@@ -412,12 +412,12 @@ public class ResourceRegistryPublisherImpl implements ResourceRegistryPublisher
 			throws SchemaViolationException, AlreadyPresentException, ResourceRegistryException {
 		try {
 			String type = er.getTypeName();
-			String json = ElementMapper.marshal(er);
 			UUID uuid = er.getID();
 			if (uuid == null) {
 				uuid = UUIDManager.getInstance().generateValidUUID();
 				er.setID(uuid);
 			}
+			String json = ElementMapper.marshal(er);
 			return create(type, json, uuid);
 		} catch (ResourceRegistryException e) {
 			// logger.trace("Error Creating {}", facet, e);