diff --git a/lib/Alchemy/Phrasea/Controller/Admin/Users.php b/lib/Alchemy/Phrasea/Controller/Admin/Users.php
index a863ee8466..562518b00f 100644
--- a/lib/Alchemy/Phrasea/Controller/Admin/Users.php
+++ b/lib/Alchemy/Phrasea/Controller/Admin/Users.php
@@ -98,7 +98,7 @@ class Users implements ControllerProviderInterface
             $rights = new UserHelper\Edit($app, $app['request']);
             $rights->apply_quotas();
 
-            return;
+            return $app->json(array('message' => '', 'error'   => false));
         });
 
         $controllers->post('/rights/time/', function(Application $app) {
@@ -111,7 +111,7 @@ class Users implements ControllerProviderInterface
             $rights = new UserHelper\Edit($app, $app['request']);
             $rights->apply_time();
 
-            return;
+            return $app->json(array('message' => '', 'error'   => false));
         });
 
         $controllers->post('/rights/masks/', function(Application $app) {
@@ -124,7 +124,7 @@ class Users implements ControllerProviderInterface
             $rights = new UserHelper\Edit($app, $app['request']);
             $rights->apply_masks();
 
-            return;
+            return $app->json(array('message' => '', 'error'   => false));
         });
 
         $controllers->match('/search/', function(Application $app) {
diff --git a/lib/Alchemy/Phrasea/Controller/Prod/Edit.php b/lib/Alchemy/Phrasea/Controller/Prod/Edit.php
index ba10870ccf..6462b07966 100644
--- a/lib/Alchemy/Phrasea/Controller/Prod/Edit.php
+++ b/lib/Alchemy/Phrasea/Controller/Prod/Edit.php
@@ -302,7 +302,7 @@ class Edit implements ControllerProviderInterface
             }
 
             if (!is_array($request->request->get('mds'))) {
-                return;
+                return $app->json(array('message' => '', 'error'   => false));
             }
 
             $databoxes = $records->databoxes();
diff --git a/lib/classes/databox.class.php b/lib/classes/databox.class.php
index 6b6ea9199e..bb90fc248e 100644
--- a/lib/classes/databox.class.php
+++ b/lib/classes/databox.class.php
@@ -965,10 +965,14 @@ class databox extends base
 
         $thesaurus = $this->get_thesaurus();
 
-        if ($thesaurus && ($tmp = DomDocument::loadXML($thesaurus)) !== false)
+        $dom = new DOMDocument();
+
+        if ($thesaurus && false !== $tmp = $dom->loadXML($thesaurus)) {
             self::$_dom_thesaurus[$sbas_id] = $tmp;
-        else
+        } else {
             self::$_dom_thesaurus[$sbas_id] = false;
+            unset($dom);
+        }
 
         return self::$_dom_thesaurus[$sbas_id];
     }