From 57f15ddc025444a125607d3ea22ac01bc276112c Mon Sep 17 00:00:00 2001
From: Yanzhen Yu <yanzhen@smartx.com>
Date: Wed, 1 Apr 2026 12:00:00 +0800
Subject: [PATCH] fix #460 ignore added node that are not in document anymore

---
 src/record/mutation.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/record/mutation.ts b/src/record/mutation.ts
index 9d90daf9..3689c1b8 100644
--- a/src/record/mutation.ts
+++ b/src/record/mutation.ts
@@ -210,7 +210,7 @@ export default class MutationBuffer {
       return nextId;
     };
     const pushAdd = (n: Node) => {
-      if (!n.parentNode) {
+      if (!n.parentNode || !document.contains(n)) {
         return;
       }
       const parentId = mirror.getId((n.parentNode as Node) as INode);