From fc15f39ece2522c2a2b360d1b1fa069de0876a02 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Yingyi=20/=20=E9=A2=96=E9=80=B8?=
 <49649786+Zuoqiu-Yingyi@users.noreply.github.com>
Date: Fri, 26 May 2023 22:03:24 +0800
Subject: [PATCH] fix issue of accessing undefined `tab.headElement` (#8363)

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

diff --git a/app/src/layout/dock/Custom.ts b/app/src/layout/dock/Custom.ts
index 700047ea9..34a7e056a 100644
--- a/app/src/layout/dock/Custom.ts
+++ b/app/src/layout/dock/Custom.ts
@@ -24,7 +24,7 @@ export class Custom extends Model {
     }) {
         super({app: options.app, id: options.tab.id});
         if (window.siyuan.config.fileTree.openFilesUseCurrentTab) {
-            options.tab.headElement.classList.add("item--unupdate");
+            options.tab.headElement?.classList.add("item--unupdate");
         }
 
         this.element = options.tab.panelElement;