diff --git a/wms/wipwhole-rec-invoice-edit-fileupload.php b/wms/wipwhole-rec-invoice-edit-fileupload.php
index 933d44f1..98acc091 100644
--- a/wms/wipwhole-rec-invoice-edit-fileupload.php
+++ b/wms/wipwhole-rec-invoice-edit-fileupload.php
@@ -39,7 +39,9 @@ function fileIUploads($post_name)
             }
         }
     }
-    return json_encode($file_arr, JSON_UNESCAPED_UNICODE);
+    if (count($file_arr) !== 0)
+        return json_encode($file_arr, JSON_UNESCAPED_UNICODE);
+    return "";
 }
 
 // 營業