diff --git a/application/controllers/infofix.php b/application/controllers/infofix.php
index 18125d8a..1522e2f8 100644
--- a/application/controllers/infofix.php
+++ b/application/controllers/infofix.php
@@ -26,7 +26,13 @@ class infofix extends CI_Controller
     $key_arr = explode(',', $keys);
 
     // 容错
-    if (empty($site) || empty($keys) || strpos($keys, '/') === false) {
+    if (
+      empty($site) ||
+      empty($keys) ||
+      mb_stripos($keys, '/') === false ||
+      mb_stripos($keys, 'undefined') !== false ||
+      mb_stripos($keys, 'null') !== false
+    ) {
       echo json_encode(array());
       return false;
     }