diff --git a/WarehouseMgr/Tnb.WarehouseMgr/WareHouseService.cs b/WarehouseMgr/Tnb.WarehouseMgr/WareHouseService.cs
index 2bd801c2..df750f22 100644
--- a/WarehouseMgr/Tnb.WarehouseMgr/WareHouseService.cs
+++ b/WarehouseMgr/Tnb.WarehouseMgr/WareHouseService.cs
@@ -279,7 +279,10 @@ namespace Tnb.WarehouseMgr
             foreach (var pid in pointIds)
             {
                 var point = points.Find(x => x.id == pid);
-                results.Add(point);
+                if (point != null)
+                {
+                    results.Add(point);
+                }
             }
 
             #region dijkstra