diff --git a/Service/DeviceService.cs b/Service/DeviceService.cs
index 47d4535..a6b53c1 100644
--- a/Service/DeviceService.cs
+++ b/Service/DeviceService.cs
@@ -50,8 +50,8 @@ namespace LY.App.Service
 
             items.ForEach(async s =>
             {
-                var key= RedisKeyList.DeviceStatus(s.DeviceSN);
-                s.online = await _redisService.ExistsAsync(key);
+                var status = await _redisService.ExistsAsync(RedisKeyList.DeviceStatus(s.DeviceSN));
+                s.online = status;
             });
             return new ApiResult()
             {