diff --git a/web_src/js/features/repo-legacy.js b/web_src/js/features/repo-legacy.js
index 670e60def0..b65938b045 100644
--- a/web_src/js/features/repo-legacy.js
+++ b/web_src/js/features/repo-legacy.js
@@ -57,6 +57,7 @@ export function initRepoCommentForm() {
 
   function initBranchSelector() {
     const elSelectBranch = document.querySelector('.ui.dropdown.select-branch');
+    if (!elSelectBranch) return;
     const isForNewIssue = elSelectBranch.getAttribute('data-for-new-issue') === 'true';
 
     const $selectBranch = $(elSelectBranch);