diff --git a/webapp/controller/OutAppNftController.class.php b/webapp/controller/OutAppNftController.class.php
index fa47f6a0..368d88a1 100644
--- a/webapp/controller/OutAppNftController.class.php
+++ b/webapp/controller/OutAppNftController.class.php
@@ -506,6 +506,10 @@ class OutAppNftController extends BaseController {
     public static function mergeAttr(&$tarAttrs, $srcAttrs)
     {
         foreach ($srcAttrs as $srcAttr) {
+            if (!isset($srcAttr['new_attr']) ||
+                !$srcAttr['new_attr']) {
+                continue;
+            }
             $found = false;
             foreach ($tarAttrs as &$tarAttr) {
                 if ($tarAttr['attr_id'] == $srcAttr['attr_id']) {