diff --git a/WarehouseMgr/Tnb.WarehouseMgr/TimedTaskBackgroundService.cs b/WarehouseMgr/Tnb.WarehouseMgr/TimedTaskBackgroundService.cs
index 8eb61c17..55ba81df 100644
--- a/WarehouseMgr/Tnb.WarehouseMgr/TimedTaskBackgroundService.cs
+++ b/WarehouseMgr/Tnb.WarehouseMgr/TimedTaskBackgroundService.cs
@@ -32,7 +32,7 @@ namespace Tnb.WarehouseMgr
     /// </summary>
     public class TimedTaskBackgroundService : BackgroundService
     {
-        private IEventPublisher _eventPublisher;
+        private IEventPublisher _eventPublisher = default!;
 
         protected override Task ExecuteAsync(CancellationToken stoppingToken) => Task.Run(() =>
               {