From 3efe809d274f71c8b34e58b97255ea1d6a319f57 Mon Sep 17 00:00:00 2001
From: Copilot <198982749+Copilot@users.noreply.github.com>
Date: Mon, 16 Feb 2026 17:01:41 +0200
Subject: [PATCH] Guard `isValidImageUrl` against nullish `avatar_url` inputs
 (#5172)

* Initial plan

* fix: guard isValidImageUrl against nullish input

Co-authored-by: Cohee1207 <18619528+Cohee1207@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: Cohee1207 <18619528+Cohee1207@users.noreply.github.com>
---
 public/scripts/group-chats.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/public/scripts/group-chats.js b/public/scripts/group-chats.js
index c8a2bcb52..d54ec73aa 100644
--- a/public/scripts/group-chats.js
+++ b/public/scripts/group-chats.js
@@ -857,7 +857,7 @@ function updateGroupAvatar(group) {
  */
 function isValidImageUrl(url) {
     // check if empty dict
-    if (Object.keys(url).length === 0) {
+    if (!url || Object.keys(url).length === 0) {
         return false;
     }
     return isDataURL(url) || (url && (url.startsWith('user') || url.startsWith('/user')));