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-rw-r--r--p/scripts/main.js2
1 files changed, 2 insertions, 0 deletions
diff --git a/p/scripts/main.js b/p/scripts/main.js
index 30fc795a1..268fd2858 100644
--- a/p/scripts/main.js
+++ b/p/scripts/main.js
@@ -777,8 +777,10 @@ function rememberOpenCategory(category_id, isOpen) {
function openCategory(category_id) {
const category_element = document.getElementById(category_id);
+ if (!category_element) return;
category_element.querySelector('.tree-folder-items').classList.add('active');
const img = category_element.querySelector('a.dropdown-toggle img');
+ if (!img) return;
img.src = img.src.replace('/icons/down.', '/icons/up.');
img.alt = '🔼';
}