diff --git a/lib/classes/Translator.php b/lib/classes/Translator.php
index 7ffc3bf77..50dd8e9d1 100644
--- a/lib/classes/Translator.php
+++ b/lib/classes/Translator.php
@@ -164,7 +164,7 @@ class Translator extends Util\Singleton
      */
     public static function translate($string, $parameters = [], $domain = null, $locale = null)
     {
-        $translator = self::getInstance();
+        $translator = self::getInstance()->getTranslator();
         if (!empty($translator)) {
             return $translator->trans($string, $parameters, $domain, $locale);
         } else {
diff --git a/lib/classes/Util/Singleton.php b/lib/classes/Util/Singleton.php
index 184c0577a..38de2d669 100644
--- a/lib/classes/Util/Singleton.php
+++ b/lib/classes/Util/Singleton.php
@@ -7,7 +7,7 @@ namespace Util;
  */
 abstract class Singleton
 {
-    /** @var \Util\Singleton Oggetto istanziato */
+    /** @var \Util\Singleton Oggetti istanziati */
     protected static $instance = [];
 
     protected function __construct()
@@ -23,7 +23,7 @@ abstract class Singleton
     {
         $class = get_called_class(); // late-static-bound class name
 
-        if (self::$instance[$class] === null) {
+        if (!isset(self::$instance[$class])) {
             self::$instance[$class] = new static();
         }
 
diff --git a/lib/functions.js b/lib/functions.js
index 2bfc460b0..47bd5a677 100644
--- a/lib/functions.js
+++ b/lib/functions.js
@@ -453,6 +453,7 @@ function start_datatables() {
                 ordering: true,
                 searching: true,
                 paging: false,
+                order: [],
                 lengthChange: false,
                 scrollY: "50vh",
             });