From d32d91bebc54939585c4a371c8d5bf898f674d12 Mon Sep 17 00:00:00 2001
From: CHUXK <chu295@qq.com>
Date: Fri, 10 Apr 2020 11:28:32 +0800
Subject: [PATCH] Update sidebar.js

fix bug https://github.com/docsifyjs/docsify/issues/1110
---
 src/core/event/sidebar.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/core/event/sidebar.js b/src/core/event/sidebar.js
index f252f2b4..5c09fb2b 100644
--- a/src/core/event/sidebar.js
+++ b/src/core/event/sidebar.js
@@ -38,7 +38,8 @@ export function collapse(el) {
   dom.on(el, 'click', ({ target }) => {
     if (
       target.nodeName === 'A' &&
-      target.nextSibling &&
+      target.nextSibling &&      
+      target.nextSibling.classList &&
       target.nextSibling.classList.contains('app-sub-sidebar')
     ) {
       dom.toggleClass(target.parentNode, 'collapse');