diff --git a/typo3/sysext/install/Classes/Service/LanguagePackService.php b/typo3/sysext/install/Classes/Service/LanguagePackService.php
index a6fcb33491a23bfb3dbb30a7bc9c8e80c133ed83..2455718c1f8dbe72b837b585219084cae95c3f40 100644
--- a/typo3/sysext/install/Classes/Service/LanguagePackService.php
+++ b/typo3/sysext/install/Classes/Service/LanguagePackService.php
@@ -77,7 +77,8 @@ class LanguagePackService
      */
     public function getActiveLanguages(): array
     {
-        return $GLOBALS['TYPO3_CONF_VARS']['EXTCONF']['lang']['availableLanguages'] ?? [];
+        $availableLanguages = $GLOBALS['TYPO3_CONF_VARS']['EXTCONF']['lang']['availableLanguages'] ?? [];
+        return array_filter($availableLanguages);
     }
 
     /**