diff --git a/src/main/java/org/gcube/portlets/user/statisticalalgorithmsimporter/server/SessionUtil.java b/src/main/java/org/gcube/portlets/user/statisticalalgorithmsimporter/server/SessionUtil.java
index 380d568..0474301 100644
--- a/src/main/java/org/gcube/portlets/user/statisticalalgorithmsimporter/server/SessionUtil.java
+++ b/src/main/java/org/gcube/portlets/user/statisticalalgorithmsimporter/server/SessionUtil.java
@@ -37,11 +37,11 @@ public class SessionUtil {
 			throws StatAlgoImporterServiceException {
 		return getServiceCredentials(httpServletRequest, null);
 	}
-	
+
 	public static ServiceCredentials getServiceCredentials(
 			HttpServletRequest httpServletRequest, String scopeGroupId)
 			throws StatAlgoImporterServiceException {
-		
+
 		ServiceCredentials sCredentials = null;
 		String userName = null;
 		String scope = null;
@@ -58,16 +58,37 @@ public class SessionUtil {
 		} else {
 			logger.info("Retrieving credential in session!");
 			PortalContext pContext = PortalContext.getConfiguration();
-			if(scopeGroupId!=null&&!scopeGroupId.isEmpty()){
+			if (scopeGroupId != null && !scopeGroupId.isEmpty()) {
 				scope = pContext.getCurrentScope(scopeGroupId);
 			} else {
 				scope = pContext.getCurrentScope(httpServletRequest);
 			}
-		
+
+			if (scope == null || scope.isEmpty()) {
+				String error = "Error retrieving scope: " + scope;
+				logger.error(error);
+				throw new StatAlgoImporterServiceException(error);
+			}
+
 			userName = pContext.getCurrentUser(httpServletRequest)
 					.getUsername();
-			
+
+			if (userName == null || userName.isEmpty()) {
+				String error = "Error retrieving username in scope " + scope
+						+ ": " + userName;
+				logger.error(error);
+				throw new StatAlgoImporterServiceException(error);
+			}
+
 			token = pContext.getCurrentUserToken(httpServletRequest);
+
+			if (token == null || token.isEmpty()) {
+				String error = "Error retrieving token for " + userName
+						+ " in " + scope + ": " + token;
+				logger.error(error);
+				throw new StatAlgoImporterServiceException(error);
+			}
+
 			String name = pContext.getCurrentUser(httpServletRequest)
 					.getFirstName();
 			String lastName = pContext.getCurrentUser(httpServletRequest)
@@ -85,8 +106,8 @@ public class SessionUtil {
 			String groupName = pContext.getCurrentGroupName(httpServletRequest);
 
 			sCredentials = new ServiceCredentials(userName, fullName, name,
-					lastName, email, scope, groupId, groupName, userAvatarURL, token);
-
+					lastName, email, scope, groupId, groupName, userAvatarURL,
+					token);
 		}
 
 		logger.info("ServiceCredentials: " + sCredentials);
@@ -94,10 +115,6 @@ public class SessionUtil {
 		return sCredentials;
 	}
 
-	
-	
-	
-	
 	//
 	public static ArrayList<Recipient> getRecipients(
 			ServletContext servletContest) {