From 2e12343fc4ca96a215d6820c4467b619eaa5cbe9 Mon Sep 17 00:00:00 2001
From: cloudchamb3r <jizon0123@protonmail.com>
Date: Wed, 9 Oct 2024 02:27:05 +0900
Subject: [PATCH] Add null check for responseData.invalidTopics (#32212)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

<img width="553" alt="Screenshot 2024-10-08 at 10 49 10 AM"
src="https://github.com/user-attachments/assets/faeef64d-684a-4aba-b7fc-c7c6a0301abe">

`responseData.invalidTopics` can be null but it wasn't handled.
---
 web_src/js/features/repo-home.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/web_src/js/features/repo-home.ts b/web_src/js/features/repo-home.ts
index f3e39ddb3c..ed1415d286 100644
--- a/web_src/js/features/repo-home.ts
+++ b/web_src/js/features/repo-home.ts
@@ -60,7 +60,7 @@ export function initRepoTopicBar() {
       // how to test: input topic like " invalid topic " (with spaces), and select it from the list, then "Save"
       const responseData = await response.json();
       lastErrorToast = showErrorToast(responseData.message, {duration: 5000});
-      if (responseData.invalidTopics.length > 0) {
+      if (responseData.invalidTopics && responseData.invalidTopics.length > 0) {
         const {invalidTopics} = responseData;
         const topicLabels = queryElemChildren(topicDropdown, 'a.ui.label');
         for (const [index, value] of topics.split(',').entries()) {