diff --git a/library/think/model/Relation.php b/library/think/model/Relation.php
index 69b80270..22670bdd 100644
--- a/library/think/model/Relation.php
+++ b/library/think/model/Relation.php
@@ -318,11 +318,7 @@ class Relation
             }
         }
 
-        if (!isset($list[$relation])) {
-            // 设置关联模型属性
-            $list[$relation] = [];
-        }
-        $result->setAttr($relation, (new $model($list[$relation]))->isUpdate(true));
+        $result->setAttr($relation, !isset($list[$relation]) ? null : (new $model($list[$relation]))->isUpdate(true));
     }
 
     /**