diff --git a/29WxOrderWpf/Ctrls/OrderCtrls/OrderListCtrl.xaml.cs b/29WxOrderWpf/Ctrls/OrderCtrls/OrderListCtrl.xaml.cs
index a78fe59..887bb72 100644
--- a/29WxOrderWpf/Ctrls/OrderCtrls/OrderListCtrl.xaml.cs
+++ b/29WxOrderWpf/Ctrls/OrderCtrls/OrderListCtrl.xaml.cs
@@ -1701,18 +1701,18 @@ namespace _29WxOrderWpf.Ctrls.OrderCtrls
 
 			lock (MainWindow._orderLock)
 			{
-				orderExist = GlobalConfig.lstFilterOrder.ToList().FirstOrDefault(o => o.order_id == order.order_id);
+				orderExist = GlobalConfig.lstFilterOrder.FirstOrDefault(o => o.order_id == order.order_id);
 			}
 			while (orderExist != null)
 			{
-				Dispatcher.Invoke(() =>
+				await Dispatcher.InvokeAsync(() =>
 				{
-					GlobalConfig.lstFilterOrder.Remove(orderExist);
+					lock (MainWindow._orderLock)
+					{
+						GlobalConfig.lstFilterOrder.Remove(orderExist);
+						orderExist = GlobalConfig.lstFilterOrder.FirstOrDefault(o => o.order_id == order.order_id);
+					}
 				});
-				lock (MainWindow._orderLock)
-				{
-					orderExist = GlobalConfig.lstFilterOrder.ToList().FirstOrDefault(o => o.order_id == order.order_id);
-				}
 			}
 
 			if (!GetOrderIsFilter(order))