From 8dc57763f55a01d40ed2991528f1e587bcb179ba Mon Sep 17 00:00:00 2001
From: MT-Mint <798521692@qq.com>
Date: Wed, 8 Apr 2026 14:33:04 +0800
Subject: [PATCH] =?UTF-8?q?fix(threads):=20=E9=81=BF=E5=85=8D=E9=9A=90?=
 =?UTF-8?q?=E5=BC=8F=E8=AE=A2=E9=98=85=20events=20=E6=B5=81?=
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---
 frontend/src/core/threads/hooks.ts | 19 +++++++++++--------
 1 file changed, 11 insertions(+), 8 deletions(-)

diff --git a/frontend/src/core/threads/hooks.ts b/frontend/src/core/threads/hooks.ts
index d8bc08d3..522f8123 100644
--- a/frontend/src/core/threads/hooks.ts
+++ b/frontend/src/core/threads/hooks.ts
@@ -193,14 +193,17 @@ export function useThreadStream({
       handleStreamStart(meta.thread_id);
       setOnStreamThreadId(meta.thread_id);
     },
-    onLangChainEvent(event) {
-      if (event.event === "on_tool_end") {
-        listeners.current.onToolEnd?.({
-          name: event.name,
-          data: event.data,
-        });
-      }
-    },
+    onLangChainEvent:
+      onToolEnd == null
+        ? undefined
+        : (event) => {
+            if (event.event === "on_tool_end") {
+              listeners.current.onToolEnd?.({
+                name: event.name,
+                data: event.data,
+              });
+            }
+          },
     onUpdateEvent(data) {
       const updates: Array<Partial<AgentThreadState> | null> = Object.values(
         data || {},