diff --git a/webapp/models/Chip.php b/webapp/models/Chip.php
index 31a6e29f..eed5c273 100644
--- a/webapp/models/Chip.php
+++ b/webapp/models/Chip.php
@@ -277,6 +277,7 @@ class Chip extends BaseModel
                 }
             }
         }
+        $randAttr = array_values($randAttr);
         $fieldsKv = array(
             'item_id' => $itemMeta['id'],
             'item_num' => 1,