diff --git a/application/controllers/system/Users.php b/application/controllers/system/Users.php
index aeef474ff..db58980ea 100644
--- a/application/controllers/system/Users.php
+++ b/application/controllers/system/Users.php
@@ -100,16 +100,22 @@ class Users extends VileSci_Controller
 		// Load model PrestudentstatusModel
         $this->load->model('crm/Prestudentstatus_model', 'PrestudentstatusModel');
         
-        $result = $this->PrestudentstatusModel->updateStufe($prestudentIdArray, $stufe);
+        $result = error("No valid parameters");
+        if (isset($stufe) && isset($prestudentIdArray) && is_array($prestudentIdArray) && count($prestudentIdArray) >0)
+        {
+			$result = $this->PrestudentstatusModel->updateStufe($prestudentIdArray, $stufe);
+		}
+        
+        $this->output->set_header('Content-Type: application/json; charset=utf-8');
         
         if (isSuccess($result))
         {
 			$href = str_replace("/system/Users/linkToStufe", "/system/Users", $_SERVER["REQUEST_URI"]);
-			echo "<div>Data correctly saved - <a href=\"" . $href . "\">Back</a></div>";
+			echo '{"msg": "Data correctly saved"}';
         }
         else
         {
-			echo "<div>Error occurred while saving data, please contact the administrator.</div>";
+			echo '{"msg": "Error occurred while saving data, please contact the administrator"}';
         }
 	}
 	
@@ -121,16 +127,20 @@ class Users extends VileSci_Controller
 		// Load model PrestudentstatusModel
         $this->load->model('crm/Prestudent_model', 'PrestudentModel');
         
-        $result = $this->PrestudentModel->updateAufnahmegruppe($prestudentIdArray, $aufnahmegruppe);
+        $result = error("No valid parameters");
+        if (isset($aufnahmegruppe) && isset($prestudentIdArray) && is_array($prestudentIdArray) && count($prestudentIdArray) >0)
+        {
+			$result = $this->PrestudentModel->updateAufnahmegruppe($prestudentIdArray, $aufnahmegruppe);
+		}
         
         if (isSuccess($result))
         {
 			$href = str_replace("/system/Users/linkToAufnahmegruppe", "/system/Users", $_SERVER["REQUEST_URI"]);
-			echo "<div>Data correctly saved - <a href=\"" . $href . "\">Back</a></div>";
+			echo '{"msg": "Data correctly saved"}';
         }
         else
         {
-			echo "<div>Error occurred while saving data, please contact the administrator.</div>";
+			echo '{"msg": "Error occurred while saving data, please contact the administrator"}';
         }
 	}
 	
diff --git a/application/views/system/users.php b/application/views/system/users.php
index e93177081..5bda4f1b5 100644
--- a/application/views/system/users.php
+++ b/application/views/system/users.php
@@ -198,22 +198,38 @@
 			if ($("#linkToStufe"))
 			{
 				$("#linkToStufe").click(function() {
-					if ($("#linkUsersForm"))
-					{
-						$("#linkUsersForm").attr("action", "<?php echo $hrefLinkToStufe; ?>");
-						$("#linkUsersForm").submit();
-					}
+					$.ajax({
+						type: "POST",
+						dataType: "json",
+						url: "<?php echo $hrefLinkToStufe; ?>",
+						data: $("#linkUsersForm").serialize(),
+						success: function(data, textStatus, jqXHR) {
+							alert(data.msg);
+							$("#usersFiltersForm").submit();
+						},
+						error: function(jqXHR, textStatus, errorThrown) {
+							alert(textStatus + " - " + errorThrown + " - " + jqXHR.responseText);
+						}
+					});
 				});
 			}
 
 			if ($("#linkToGruppe"))
 			{
 				$("#linkToGruppe").click(function() {
-					if ($("#linkUsersForm"))
-					{
-						$("#linkUsersForm").attr("action", "<?php echo $hrefLinkToAufnahmegruppe; ?>");
-						$("#linkUsersForm").submit();
-					}
+					$.ajax({
+						type: "POST",
+						dataType: "json",
+						url: "<?php echo $hrefLinkToAufnahmegruppe; ?>",
+						data: $("#linkUsersForm").serialize(),
+						success: function(data, textStatus, jqXHR) {
+							alert(data.msg);
+							$("#usersFiltersForm").submit();
+						},
+						error: function(jqXHR, textStatus, errorThrown) {
+							alert(textStatus + " - " + errorThrown + " - " + jqXHR.responseText);
+						}
+					});
 				});
 			}