diff --git a/lightrag/api/graph_viewer_webui/src/api/lightrag.ts b/lightrag/api/graph_viewer_webui/src/api/lightrag.ts
index 89398e61..648e26d9 100644
--- a/lightrag/api/graph_viewer_webui/src/api/lightrag.ts
+++ b/lightrag/api/graph_viewer_webui/src/api/lightrag.ts
@@ -81,7 +81,7 @@ export const checkHealth = async (): Promise<
   } catch (e) {
     return {
       status: 'error',
-      message: `${e}`
+      message: e instanceof Error ? e.message : `${e}`
     }
   }
 }
diff --git a/lightrag/api/graph_viewer_webui/src/hooks/useLightragGraph.tsx b/lightrag/api/graph_viewer_webui/src/hooks/useLightragGraph.tsx
index 44ce820a..3925de0d 100644
--- a/lightrag/api/graph_viewer_webui/src/hooks/useLightragGraph.tsx
+++ b/lightrag/api/graph_viewer_webui/src/hooks/useLightragGraph.tsx
@@ -53,7 +53,9 @@ const fetchGraph = async (label: string) => {
   try {
     rawData = await queryGraphs(label)
   } catch (e) {
-    useBackendState.getState().setErrorMessage(`${e}`, 'Query Graphs Error!')
+    useBackendState
+      .getState()
+      .setErrorMessage(e instanceof Error ? e.message : `${e}`, 'Query Graphs Error!')
     return null
   }