diff --git a/OpenAuth.WebApi/Controllers/ServiceControllers/AirportMaintenanceController.cs b/OpenAuth.WebApi/Controllers/ServiceControllers/AirportMaintenanceController.cs
index 5fa36fa..1cc2cc0 100644
--- a/OpenAuth.WebApi/Controllers/ServiceControllers/AirportMaintenanceController.cs
+++ b/OpenAuth.WebApi/Controllers/ServiceControllers/AirportMaintenanceController.cs
@@ -749,14 +749,19 @@ namespace OpenAuth.WebApi.Controllers.ServiceControllers
                 //        return result;
                 //    }
                 //}
-                var existingLocked = ParseClient(await _cache.HashGetAllAsync($"client:{info.DeviceSn}"));
-                if (existingLocked.DeviceSn == info.DeviceSn && existingLocked.UserId != info.UserId && existingLocked.IsLock)
+                var hashEntries = await _cache.HashGetAllAsync($"client:{info.DeviceSn}");
+                if (hashEntries.Length > 0)
                 {
-                    result.Code = 400;
-                    result.Message = "已有用户处于锁定状态，不能添加新的锁定用户。";
-                    result.Result = false;
-                    return result;
+                    var existingLocked = ParseClient(hashEntries);
+                    if (existingLocked.DeviceSn == info.DeviceSn && existingLocked.UserId != info.UserId && existingLocked.IsLock)
+                    {
+                        result.Code = 400;
+                        result.Message = "已有用户处于锁定状态，不能添加新的锁定用户。";
+                        result.Result = false;
+                        return result;
+                    }
                 }
+                
                 // 存客户端信息
                 _cache.HashSetAsync(clientKey, new HashEntry[]
                 {