diff --git a/library/think/Model.php b/library/think/Model.php
index 93953f2c..4176a12d 100644
--- a/library/think/Model.php
+++ b/library/think/Model.php
@@ -292,7 +292,9 @@ abstract class Model implements \JsonSerializable, \ArrayAccess
         }
 
         // 标记字段更改
-        if (!isset($this->data[$name]) || (0 !== strcmp($this->data[$name], $value) && !in_array($name, $this->change))) {
+        if (isset($this->data[$name]) && is_scalar($this->data[$name]) && is_scalar($value) && 0 !== strcmp($this->data[$name], $value)) {
+            $this->change[] = $name;
+        } elseif (!isset($this->data[$name]) || $value != $this->data[$name]) {
             $this->change[] = $name;
         }
         // 设置数据对象属性