From 7fb9602961e37f8c58397fc0a26817de9d5ee36f Mon Sep 17 00:00:00 2001
From: wxiaoguang <wxiaoguang@gmail.com>
Date: Sun, 2 Aug 2026 22:55:17 +0800
Subject: [PATCH] fix: remove the pull merge box from UI when the refreshed
 page doesn't contain it (#38742) (#38744)

backport #38742
---
 web_src/js/features/repo-issue-pull.ts | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/web_src/js/features/repo-issue-pull.ts b/web_src/js/features/repo-issue-pull.ts
index 853d869e3e..110d5a9051 100644
--- a/web_src/js/features/repo-issue-pull.ts
+++ b/web_src/js/features/repo-issue-pull.ts
@@ -80,7 +80,13 @@ export function initRepoPullMergeBox(el: HTMLElement) {
       return;
     }
     document.removeEventListener('visibilitychange', onVisibilityChange);
-    const newElem = createElementFromHTML(await resp.text());
+
+    const respText = (await resp.text()).trim();
+    if (!respText) {
+      el.remove(); // merge box might not exist if the PR has changed (e.g.: merged and the head branch has been deleted)
+      return;
+    }
+    const newElem = createElementFromHTML(respText);
     el.replaceWith(newElem);
   };