From f1d6d949f12f1fac4331cdb5141ca4951af867ae Mon Sep 17 00:00:00 2001
From: yangdx <gzdaniel@me.com>
Date: Tue, 9 Sep 2025 11:39:59 +0800
Subject: [PATCH] Fix assistant message display content fallback logic

- Handle undefined vs empty string cases
- Prevent COT content keep rendering before </think> tag recieved
---
 lightrag_webui/src/components/retrieval/ChatMessage.tsx | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lightrag_webui/src/components/retrieval/ChatMessage.tsx b/lightrag_webui/src/components/retrieval/ChatMessage.tsx
index c83169d9..d04686a5 100644
--- a/lightrag_webui/src/components/retrieval/ChatMessage.tsx
+++ b/lightrag_webui/src/components/retrieval/ChatMessage.tsx
@@ -53,7 +53,7 @@ export const ChatMessage = ({ message }: { message: MessageWithError }) => { //
   // For assistant messages, we prefer displayContent but fallback to content for backward compatibility
   const finalDisplayContent = message.role === 'user'
     ? message.content
-    : displayContent || message.content || ''
+    : (displayContent !== undefined ? displayContent : (message.content || ''))
 
   // Load KaTeX dynamically
   useEffect(() => {