diff --git a/library/think/Model.php b/library/think/Model.php
index ebeffbb4..b38778ab 100644
--- a/library/think/Model.php
+++ b/library/think/Model.php
@@ -508,7 +508,7 @@ abstract class Model implements \JsonSerializable, \ArrayAccess
                 $value = json_decode($value, true);
                 break;
             case 'array':
-                $value = is_null($value) ? [] : json_decode($value, true);
+                $value = empty($value) ? [] : json_decode($value, true);
                 break;
             case 'object':
                 $value = empty($value) ? new \stdClass() : json_decode($value);