diff --git a/lib/Form/AssetsController.php b/lib/Form/AssetsController.php
index b272db02d0..aac251f14c 100644
--- a/lib/Form/AssetsController.php
+++ b/lib/Form/AssetsController.php
@@ -38,6 +38,9 @@ class AssetsController {
     echo '<script src="' . self::RECAPTCHA_API_URL . '" async defer></script>';
     $scripts = ob_get_contents();
     ob_end_clean();
+    if ($scripts === false) {
+      return '';
+    }
     return $scripts;
   }