diff --git a/application/api/behavior/RequestFilter.php b/application/api/behavior/RequestFilter.php
index 7995a13..fc15161 100644
--- a/application/api/behavior/RequestFilter.php
+++ b/application/api/behavior/RequestFilter.php
@@ -68,7 +68,7 @@ class RequestFilter {
 
             $newData = [];
             foreach ($rule as $item) {
-                $newData[$item['fieldName']] = $data[$item['fieldName']];
+                $newData[$item['fieldName']] = isset($data[$item['fieldName']])? $data[$item['fieldName']] : '';
                 if (!$item['isMust'] && $item['default'] !== '' && !isset($data[$item['fieldName']])) {
                     $newData[$item['fieldName']] = $item['default'];
                 }