From 26a11776e4070af30b864ab0ddf25dcda21631a7 Mon Sep 17 00:00:00 2001
From: dvsilch <743422767@qq.com>
Date: Mon, 17 Oct 2022 00:51:10 +0800
Subject: [PATCH] fix: add null check when start running project the
 currentButton is null

---
 javascript/imageviewer.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/javascript/imageviewer.js b/javascript/imageviewer.js
index 65a33dd7..d4ab6984 100644
--- a/javascript/imageviewer.js
+++ b/javascript/imageviewer.js
@@ -31,7 +31,7 @@ function updateOnBackgroundChange() {
             }
         })
 
-        if (modalImage.src != currentButton.children[0].src) {
+        if (currentButton?.children?.length > 0 && modalImage.src != currentButton.children[0].src) {
             modalImage.src = currentButton.children[0].src;
             if (modalImage.style.display === 'none') {
                 modal.style.setProperty('background-image', `url(${modalImage.src})`)