diff --git a/h5p.classes.php b/h5p.classes.php
index af78c0e..4b2b3a4 100644
--- a/h5p.classes.php
+++ b/h5p.classes.php
@@ -2546,7 +2546,7 @@ class H5PCore {
     $response = array(
       'success' => TRUE
     );
-    if ($message !== NULL) {
+    if ($data !== NULL) {
       $response['data'] = $data;
     }
     self::printJson($response);