diff --git a/backend/src/jobs/agent-task.ts b/backend/src/jobs/agent-task.ts
index c14d390..19dd953 100644
--- a/backend/src/jobs/agent-task.ts
+++ b/backend/src/jobs/agent-task.ts
@@ -99,8 +99,7 @@ async function handleAgentOfflineNotification(
 
     // 获取客户端完整信息
     const agent = await getAgentById(agentId);
-    const agentData = agent[0];
-    if (!agentData) {
+    if (!agent) {
       console.error(`找不到客户端数据 (ID: ${agentId})`);
       return;
     }
@@ -111,16 +110,16 @@ async function handleAgentOfflineNotification(
       status: "offline",
       previous_status: "online", // 添加previous_status变量
       time: new Date().toLocaleString("zh-CN"),
-      hostname: agentData.hostname || "未知",
-      ip_addresses: getFormattedIPAddresses(agentData.ip_addresses),
-      os: agentData.os || "未知",
+      hostname: agent.hostname || "未知",
+      ip_addresses: getFormattedIPAddresses(agent.ip_addresses),
+      os: agent.os || "未知",
       error: "客户端连接超时",
       details: `主机名: ${
-        agentData.hostname || "未知"
+        agent.hostname || "未知"
       }\nIP地址: ${getFormattedIPAddresses(
-        agentData.ip_addresses
-      )}\n操作系统: ${agentData.os || "未知"}\n最后连接时间: ${new Date(
-        agentData.updated_at
+        agent.ip_addresses
+      )}\n操作系统: ${agent.os || "未知"}\n最后连接时间: ${new Date(
+        agent.updated_at
       ).toLocaleString("zh-CN")}`,
     };
 
@@ -163,8 +162,7 @@ export async function handleAgentThresholdNotification(
       console.error(`找不到客户端 (ID: ${agentId})`);
       throw new Error(`找不到客户端 (ID: ${agentId})`);
     }
-    
-    // @ts-ignore
+
     const userId = agent.created_by; // 获取 userId
 
     // 根据具体的指标类型
diff --git a/backend/src/repositories/agent.ts b/backend/src/repositories/agent.ts
index 838398e..769223f 100644
--- a/backend/src/repositories/agent.ts
+++ b/backend/src/repositories/agent.ts
@@ -31,12 +31,17 @@ export async function getAgentMetricsByIds(agentIds: number[]) {
 }
 
 // 获取单个客户端详情
-export async function getAgentById(id: number) {
+export async function getAgentById(id: number): Promise<Agent | null> {
   const agent = await db
     .select()
     .from(agents)
     .where(eq(agents.id, id))
     .limit(1);
+
+  if (!agent || agent.length === 0) {
+    return null;
+  }
+
   return agent[0];
 }
 
diff --git a/backend/src/services/AgentService.ts b/backend/src/services/AgentService.ts
index dca6bfb..f43d803 100644
--- a/backend/src/services/AgentService.ts
+++ b/backend/src/services/AgentService.ts
@@ -1,4 +1,5 @@
 import { Bindings } from "../models/db";
+import type { Agent } from "../models/agent";
 import * as AgentRepository from "../repositories";
 import { generateToken, verifyToken } from "../utils/jwt";
 import { handleAgentThresholdNotification } from "../jobs/agent-task";
@@ -84,15 +85,29 @@ export async function updateAgentService(
 
     if (updateData.ip_addresses && updateData.ip_addresses.length > 0) {
       agent.ip_addresses = JSON.stringify(updateData.ip_addresses);
-    } else {
+    } else if (updateData.ip_addresses) {
       agent.ip_addresses = "[]";
     }
 
-    agent.name = updateData.name;
-    agent.hostname = updateData.hostname;
-    agent.os = updateData.os;
-    agent.version = updateData.version;
-    agent.status = updateData.status;
+    if (typeof updateData.name === "string") {
+      agent.name = updateData.name;
+    }
+
+    if (updateData.hostname !== undefined) {
+      agent.hostname = updateData.hostname ?? null;
+    }
+
+    if (updateData.os !== undefined) {
+      agent.os = updateData.os ?? null;
+    }
+
+    if (updateData.version !== undefined) {
+      agent.version = updateData.version ?? null;
+    }
+
+    if (updateData.status !== undefined) {
+      agent.status = updateData.status ?? null;
+    }
 
     // 执行更新
     const updatedAgent = await AgentRepository.updateAgent(agent);
@@ -359,8 +374,9 @@ export async function updateAgentStatusService(status: any) {
   }
 }
 
-export async function getAgentById(id: number) {
-  return await AgentRepository.getAgentById(id);
+export async function getAgentById(id: number): Promise<Agent | null> {
+  const agent = await AgentRepository.getAgentById(id);
+  return agent ?? null;
 }
 
 export async function getActiveAgents() {