diff --git a/src/main/java/org/gcube/portal/threadlocalexec/SmartGearsPortalValve.java b/src/main/java/org/gcube/portal/threadlocalexec/SmartGearsPortalValve.java
index 2782a46..eb1422e 100644
--- a/src/main/java/org/gcube/portal/threadlocalexec/SmartGearsPortalValve.java
+++ b/src/main/java/org/gcube/portal/threadlocalexec/SmartGearsPortalValve.java
@@ -12,6 +12,7 @@ import javax.servlet.http.HttpServletRequest;
 import org.apache.catalina.connector.Request;
 import org.apache.catalina.connector.Response;
 import org.apache.catalina.valves.ValveBase;
+import org.gcube.common.authorization.client.exceptions.ObjectNotFound;
 import org.gcube.common.authorization.library.provider.AuthorizationProvider;
 import org.gcube.common.authorization.library.provider.SecurityTokenProvider;
 import org.gcube.common.authorization.library.provider.UserInfo;
@@ -46,10 +47,18 @@ public class SmartGearsPortalValve extends ValveBase  {
 				String scope = context.getCurrentScope(request);
 				String username = getCurrentUsername(request);
 				if (scope != null && username != null) {
+					String userToken = null;
 					try {
-						String userToken = getAuthorizationToken(username, scope);
+						ScopeProvider.instance.set(scope);
+						userToken = authorizationService().resolveTokenByUserAndContext(username, scope);
 						SecurityTokenProvider.instance.set(userToken);
-					} catch (Exception e) {
+					} 
+					catch (ObjectNotFound ex) {
+						userToken = generateAuthorizationToken(username, scope);
+						SecurityTokenProvider.instance.set(userToken);
+						_log.debug("generateAuthorizationToken OK for " + username + " in scope " + scope);
+					}			
+					catch (Exception e) {
 						_log.error("Something went wrong in generating token for " + username + " in scope " + scope);
 						e.printStackTrace();
 					}
@@ -66,11 +75,16 @@ public class SmartGearsPortalValve extends ValveBase  {
 	 * @param scope
 	 * @throws Exception
 	 */
-	private static String getAuthorizationToken(String username, String scope) throws Exception {
-		ScopeProvider.instance.set(scope);
+	private static String generateAuthorizationToken(String username, String scope)  {
 		List<String> userRoles = new ArrayList<>();
 		userRoles.add(DEFAULT_ROLE);
-		String token = authorizationService().generateUserToken(new UserInfo(username, userRoles), scope);
+		String token;
+		try {
+			token = authorizationService().generateUserToken(new UserInfo(username, userRoles), scope);
+		} catch (Exception e) {
+			e.printStackTrace();
+			return null;
+		}
 		return token;
 	}