diff --git a/src/I18n/LanguageManager.php b/src/I18n/LanguageManager.php
index 53e8179172..4be0b4e5a5 100644
--- a/src/I18n/LanguageManager.php
+++ b/src/I18n/LanguageManager.php
@@ -800,8 +800,8 @@ class LanguageManager
             return $this->availableLocales;
         }
 
-        $filterLanguages = $this->config->get('FilterLanguages');
-        if (! is_string($filterLanguages) || $filterLanguages === '') {
+        $filterLanguages = $this->config->config->FilterLanguages;
+        if ($filterLanguages === '') {
             return $this->availableLocales = $this->listLocaleDir();
         }