diff --git a/src/main/java/org/gcube/keycloak/event/OrchestratorEventPublisherProviderFactory.java b/src/main/java/org/gcube/keycloak/event/OrchestratorEventPublisherProviderFactory.java
index 0cd3db3..35dd619 100644
--- a/src/main/java/org/gcube/keycloak/event/OrchestratorEventPublisherProviderFactory.java
+++ b/src/main/java/org/gcube/keycloak/event/OrchestratorEventPublisherProviderFactory.java
@@ -33,7 +33,7 @@ public class OrchestratorEventPublisherProviderFactory implements EventListenerP
     }
 
     @Override
-    public EventListenerProvider create(KeycloakSession keycloakSession) {
+    public synchronized EventListenerProvider create(KeycloakSession keycloakSession) {
         logger.debugf("Getting configured endpoint address for client '%s' in realm '%s'", ORCHESTRATOR_CLIENT_ID,
                 REALM_NAME);
 
@@ -48,7 +48,8 @@ public class OrchestratorEventPublisherProviderFactory implements EventListenerP
                 oepp = new OrchestratorEventPublisherProvider();
             }
         } catch (MalformedURLException e) {
-            logger.error("Can't create new orchestrator event publisher provider with endpoint address: " + address, e);
+            logger.error("Can't create new orchestrator event publisher provider with endpoint address: " + address,
+                    e);
             oepp = null;
         }
         return oepp;