From 7576b88c99f5b2b58caa424e97aa69c741a2f197 Mon Sep 17 00:00:00 2001
From: thinkphp <thinkphp@qq.com>
Date: Thu, 11 May 2017 14:53:43 +0800
Subject: [PATCH] =?UTF-8?q?=E4=BF=AE=E6=AD=A3=E6=A8=A1=E5=9E=8B=E6=95=B0?=
 =?UTF-8?q?=E6=8D=AE=E5=8F=98=E5=8C=96=E5=88=A4=E6=96=AD?=
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---
 library/think/Model.php | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/library/think/Model.php b/library/think/Model.php
index e92a9344..535d76a2 100644
--- a/library/think/Model.php
+++ b/library/think/Model.php
@@ -1078,6 +1078,9 @@ abstract class Model implements \JsonSerializable, \ArrayAccess
     public function getChangedData()
     {
         $data = array_udiff_assoc($this->data, $this->origin, function ($a, $b) {
+            if ((empty($b) || empty($b)) && $a !== $b) {
+                return 1;
+            }
             return is_object($a) || $a != $b ? 1 : 0;
         });