diff --git a/model/Vocabulary.php b/model/Vocabulary.php
index 8b0bc50d4..94b250993 100644
--- a/model/Vocabulary.php
+++ b/model/Vocabulary.php
@@ -302,7 +302,7 @@ public function getLabelStatistics()
     public function getConceptHierarchy($uri, $lang)
     {
         $lang = $lang ? $lang : $this->getEnvLang();
-        $fallback = count($this->config->getLanguageOrder()) > 1 ? $this->config->getLanguageOrder()[1] : $this->config->getDefaultLanguage();
+        $fallback = count($this->config->getLanguageOrder($lang)) > 1 ? $this->config->getLanguageOrder($lang)[1] : $this->config->getDefaultLanguage();
         $props = $this->config->getHierarchyProperty();
         return $this->getSparql()->queryParentList($uri, $lang, $fallback, $props);
     }