diff --git a/Classes/Service/ImageRecognition/AigudeImageRecognitionService.php b/Classes/Service/ImageRecognition/AigudeImageRecognitionService.php
index 54bc730..fd5fde4 100644
--- a/Classes/Service/ImageRecognition/AigudeImageRecognitionService.php
+++ b/Classes/Service/ImageRecognition/AigudeImageRecognitionService.php
@@ -20,7 +20,7 @@ public function sendFileToApi(FileInterface $fileObject, string $textPrompt = ''
             $urlParts[] = 'prompt=' . urlencode($textPrompt);
         }
         if (!empty($targetLanguage)) {
-            $urlParts[] = '&target_lang=' . urlencode(LanguageScriptUtility::getLanguageScript($targetLanguage));
+            $urlParts[] = '&target_lang=' . urlencode((string) LanguageScriptUtility::getLanguageScript($targetLanguage));
         }
 
         $url = $this->domain . '/img2desc_file/' . '?' . implode('&', $urlParts);