From c4f42142a8b0f369964a7d6e3a0d366611a0d5e8 Mon Sep 17 00:00:00 2001
From: Vanessa <lly219@gmail.com>
Date: Sun, 22 Jun 2025 18:11:04 +0800
Subject: [PATCH] :art: https://github.com/siyuan-note/siyuan/issues/15111

---
 app/src/layout/dock/Outline.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/app/src/layout/dock/Outline.ts b/app/src/layout/dock/Outline.ts
index ddf92c768..1a0be1228 100644
--- a/app/src/layout/dock/Outline.ts
+++ b/app/src/layout/dock/Outline.ts
@@ -398,7 +398,7 @@ export class Outline extends Model {
         });
         if (!needReload && ops.undoOperations) {
             ops.undoOperations.find((item: IOperation) => {
-                if (item.action === "update" && item.data.indexOf('data-type="NodeHeading"') > -1) {
+                if (item.action === "update" && item.data?.indexOf('data-type="NodeHeading"') > -1) {
                     needReload = true;
                     return true;
                 }