From cbdba2a74438b3c53b6c5699a3816f99d4c0fc12 Mon Sep 17 00:00:00 2001
From: zl7261 <zhenliu7261@gmail.com>
Date: Mon, 29 Sep 2025 15:22:24 +0800
Subject: [PATCH] web_ui: check node source and target

(cherry picked from commit 6a8de2edb240a86b6b2db526f5bf6a6786d11dad)
---
 lightrag_webui/src/hooks/useLightragGraph.tsx | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lightrag_webui/src/hooks/useLightragGraph.tsx b/lightrag_webui/src/hooks/useLightragGraph.tsx
index a4e48250..af47425b 100644
--- a/lightrag_webui/src/hooks/useLightragGraph.tsx
+++ b/lightrag_webui/src/hooks/useLightragGraph.tsx
@@ -338,7 +338,7 @@ const fetchGraph = async (label: string, maxDepth: number, maxNodes: number) =>
 
       const source = nodeIdMap[edge.source]
       const target = nodeIdMap[edge.target]
-      if (source !== undefined && source !== undefined) {
+      if (source !== undefined && target !== undefined) {
         const sourceNode = rawData.nodes[source]
         const targetNode = rawData.nodes[target]
         if (!sourceNode) {