diff --git a/gms/src/main/java/it/inaf/ia2/gms/manager/GroupStatusManager.java b/gms/src/main/java/it/inaf/ia2/gms/manager/GroupStatusManager.java
index 4570303ce6d229884e47c28f9881f49d28c150d3..f3792ca8d1a87e804212b7b8731c560b94251159 100644
--- a/gms/src/main/java/it/inaf/ia2/gms/manager/GroupStatusManager.java
+++ b/gms/src/main/java/it/inaf/ia2/gms/manager/GroupStatusManager.java
@@ -46,7 +46,7 @@ public class GroupStatusManager extends UserAwareComponent {
 
         Permission groupPermission = permissionsManager.getCurrentUserPermission(parentGroup);
 
-        if (Permission.includes(Permission.VIEW_MEMBERS, groupPermission)) {
+        if (!Permission.includes(groupPermission, Permission.VIEW_MEMBERS)) {
             throw new UnauthorizedException("VIEW_MEMBERS permission is needed for performing this action");
         }
 
@@ -82,16 +82,18 @@ public class GroupStatusManager extends UserAwareComponent {
         for (int i = 0; i < groups.size(); i++) {
             GroupEntity group = groups.get(i);
             String groupName = names.get(group.getId());
-            List<String> users = membersMap.get(group.getId());
-            if (users != null) {
-                for (String userId : users) {
-                    String email = usersMap.get(userId);
-                    if (email == null) {
-                        LOG.warn("Unable to retrieve information about user " + userId);
-                        continue;
+            if (groupName != null) {
+                List<String> users = membersMap.get(group.getId());
+                if (users != null) {
+                    for (String userId : users) {
+                        String email = usersMap.get(userId);
+                        if (email == null) {
+                            LOG.warn("Unable to retrieve information about user " + userId);
+                            continue;
+                        }
+                        String[] row = new String[]{groupName, email};
+                        rows.add(row);
                     }
-                    String[] row = new String[]{groupName, email};
-                    rows.add(row);
                 }
             }
         }