diff --git a/src/main/java/org/gcube/portlets/gcubeckan/gcubeckandatacatalog/server/GcubeCkanDataCatalogServiceImpl.java b/src/main/java/org/gcube/portlets/gcubeckan/gcubeckandatacatalog/server/GcubeCkanDataCatalogServiceImpl.java
index e62a95f..79952b6 100644
--- a/src/main/java/org/gcube/portlets/gcubeckan/gcubeckandatacatalog/server/GcubeCkanDataCatalogServiceImpl.java
+++ b/src/main/java/org/gcube/portlets/gcubeckan/gcubeckandatacatalog/server/GcubeCkanDataCatalogServiceImpl.java
@@ -64,6 +64,7 @@ public class GcubeCkanDataCatalogServiceImpl extends RemoteServiceServlet implem
 
 	// ckan utils methods
 	private CKanUtilsImpl instance;
+	private Object LOCK = new Object();
 
 	/**
 	 * Since it needs the scope, we need to check if it is null or not
@@ -72,13 +73,17 @@ public class GcubeCkanDataCatalogServiceImpl extends RemoteServiceServlet implem
 	private CKanUtilsImpl getCkanUtilsObj(){
 
 		if(instance == null){
-			// retrieve ckan information
-			try{
-				String currentScope = ScopeProvider.instance.get();
-				logger.debug("Scope is " + currentScope);
-				instance = new CKanUtilsImpl(currentScope);
-			}catch(Exception e){
-				logger.error("Unable to retrieve ckan information", e);
+			synchronized(LOCK){
+				if(instance == null){
+					// retrieve ckan information
+					try{
+						String currentScope = ScopeProvider.instance.get();
+						logger.debug("Scope is " + currentScope);
+						instance = new CKanUtilsImpl(currentScope);
+					}catch(Exception e){
+						logger.error("Unable to retrieve ckan information", e);
+					}
+				}
 			}
 		}