diff --git a/app/models.py b/app/models.py
index 4053ca8..116053f 100644
--- a/app/models.py
+++ b/app/models.py
@@ -249,7 +249,13 @@ class User(db.Model):
                                     return False
                             elif LDAP_TYPE == 'ad':
                                 user_ldap_groups = []
-                                for group in [g.decode("utf-8") for g in ldap_result[0][0][1]['memberOf']]:
+                                user_ad_member_of = ldap_result[0][0][1].get('memberOf')
+
+                                if not user_ad_member_of:
+                                    logging.error('User {0} does not belong to any group while LDAP_GROUP_SECURITY_ENABLED is ON'.format(self.username))
+                                    return False
+
+                                for group in [g.decode("utf-8") for g in user_ad_member_of]:
                                     user_ldap_groups += self.ad_recursive_groups( group )
 
                                 if (LDAP_ADMIN_GROUP in user_ldap_groups):
diff --git a/app/templates/admin_setting_authentication.html b/app/templates/admin_setting_authentication.html
index 3becf6e..8bb629b 100644
--- a/app/templates/admin_setting_authentication.html
+++ b/app/templates/admin_setting_authentication.html
@@ -216,7 +216,7 @@
                                                         Basic filter - The filter that will be applied to all LDAP query by PDA. (e.g. <i>(objectClass=inetorgperson)</i> for OpenLDAP and <i>(objectClass=organizationalPerson)</i> for Active Directory)
                                                     </li>
                                                     <li>
-                                                        Username field - The field PDA will look for user's username. (e.g. <i>uid</i> for OpenLDAP and <i>sAMAccountName</i> or <i>userPrincipalName</i> for Active Directory)
+                                                        Username field - The field PDA will look for user's username. (e.g. <i>uid</i> for OpenLDAP and <i>sAMAccountName</i> for Active Directory)
                                                     </li>
                                                 </ul>
                                             </dd>