diff --git a/src/main/java/org/gcube/portal/social/networking/caches/SocialNetworkingSiteFinder.java b/src/main/java/org/gcube/portal/social/networking/caches/SocialNetworkingSiteFinder.java
index 3f00681..2b8c037 100644
--- a/src/main/java/org/gcube/portal/social/networking/caches/SocialNetworkingSiteFinder.java
+++ b/src/main/java/org/gcube/portal/social/networking/caches/SocialNetworkingSiteFinder.java
@@ -94,7 +94,7 @@ public class SocialNetworkingSiteFinder {
 			return (SocialNetworkingSite) socialSitesCache.get(scope).getObjectValue();
 		else{
 			SocialNetworkingSite site = discoverSite(scope);
-			if(site != null)
+			if(socialSitesCache != null && site != null)
 				socialSitesCache.put(new Element(scope, site));
 			return site;
 		}