diff --git a/MainWindow.axaml.cs b/MainWindow.axaml.cs
index 3abffb3..d927c40 100644
--- a/MainWindow.axaml.cs
+++ b/MainWindow.axaml.cs
@@ -685,8 +685,15 @@ public partial class MainWindow : Window
         foreach (var item in LstCustomerAdressSets.SelectedItems)
             list.Add(Settings._instance.addressSets.GetAddressSetByID(
                 Convert.ToInt32(item.ToString().Split(" - ")[0])));
-
-        StartCombine(list, Convert.ToInt32(LstCustomers.SelectedItem.ToString().Split(" - ")[0]), "union");
+        try
+        {
+            StartCombine(list, Convert.ToInt32(LstCustomers.SelectedItem.ToString().Split(" - ")[0]), "union");
+        }
+        catch
+        {
+            
+        }
+        
     }
 
     private void BtnCombineIntersection_OnClick(object? sender, RoutedEventArgs e)