diff --git a/phpunit/functional/HtmlTest.php b/phpunit/functional/HtmlTest.php
index 003a2c1bfc3..f8198bf0ec8 100644
--- a/phpunit/functional/HtmlTest.php
+++ b/phpunit/functional/HtmlTest.php
@@ -1004,7 +1004,8 @@ public function testGetScssFileHash()
 
     public function testCompileScssForPlugin()
     {
-        $compiled_scss = \Html::compileScss(['file' => '/plugins/tester/css/styles.scss']);
+        // FIXME remove the `@` operator once `scssphp/scssphp` and `league/uri` PHP 8.5 deprecation fixes will be released
+        $compiled_scss = @\Html::compileScss(['file' => '/plugins/tester/css/styles.scss']);
 
         // Strip comments to ease comparison.
         $compiled_scss = \preg_replace('~/\*.*\*/~s', '', $compiled_scss);
diff --git a/src/Glpi/CustomObject/AbstractDefinition.php b/src/Glpi/CustomObject/AbstractDefinition.php
index 92abd75e65d..d6411cfa86b 100644
--- a/src/Glpi/CustomObject/AbstractDefinition.php
+++ b/src/Glpi/CustomObject/AbstractDefinition.php
@@ -713,7 +713,7 @@ public function getTranslatedName(int $count = 1): string
 
         $translations = $this->getDecodedTranslationsField();
         $language = Session::getLanguage();
-        $current_translation = $translations[$language] ?? null;
+        $current_translation = $language !== null ? ($translations[$language] ?? null) : null;
         if ($current_translation === null) {
             return $this->fields['label'];
         }
diff --git a/src/Session.php b/src/Session.php
index 9e98890b449..4c3c2b528fd 100644
--- a/src/Session.php
+++ b/src/Session.php
@@ -1921,6 +1921,9 @@ public static function cleanIDORTokens()
      **/
     public static function haveTranslations($itemtype, $field)
     {
+        if (!is_a($itemtype, CommonDropdown::class, true)) {
+            return false;
+        }
 
         return (isset($_SESSION['glpi_dropdowntranslations'][$itemtype])
               && isset($_SESSION['glpi_dropdowntranslations'][$itemtype][$field]));