diff --git a/WarehouseMgr/Tnb.WarehouseMgr/WmsOutStockService.cs b/WarehouseMgr/Tnb.WarehouseMgr/WmsOutStockService.cs
index 1719855f..df13798d 100644
--- a/WarehouseMgr/Tnb.WarehouseMgr/WmsOutStockService.cs
+++ b/WarehouseMgr/Tnb.WarehouseMgr/WmsOutStockService.cs
@@ -211,9 +211,9 @@ namespace Tnb.WarehouseMgr
                                             WmsPretaskH preTask = new()
                                             {
                                                 org_id = _userManager.User.OrganizeId,
-                                                startlocation_id = sPoint?.location_id!,
-                                                startlocation_code = sPoint?.location_code!,
-                                                endlocation_id = ePoint?.location_id!,
+                                                startlocation_id = sPoint?.location_id ?? string.Empty,
+                                                startlocation_code = sPoint?.location_code ?? string.Empty,
+                                                endlocation_id = ePoint?.location_id ?? string.Empty,
                                                 endlocation_code = ePoint?.location_code!,
                                                 start_floor = sPoint?.floor.ToString(),
                                                 end_floor = ePoint?.floor.ToString(),
@@ -223,7 +223,7 @@ namespace Tnb.WarehouseMgr
                                                 task_type = WmsWareHouseConst.WMS_PRETASK_OUTSTOCK_TYPE_ID,
                                                 carry_id = carry.id,
                                                 carry_code = carry.carry_code,
-                                                area_id = sPoint?.area_id!,
+                                                area_id = sPoint?.area_id ?? string.Empty,
                                                 area_code = it.Key,
                                                 require_id = input.data["ReturnIdentity"].ToString(),
                                                 require_code = input.data[nameof(preTask.bill_code)]?.ToString()!,