diff --git a/MainWindow.axaml.cs b/MainWindow.axaml.cs
index d927c40..31d9dbb 100644
--- a/MainWindow.axaml.cs
+++ b/MainWindow.axaml.cs
@@ -675,8 +675,14 @@ 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]), "difference");
+        try
+        {
+            StartCombine(list, Convert.ToInt32(LstCustomers.SelectedItem.ToString().Split(" - ")[0]), "difference");
+        }
+        catch
+        {
+            
+        }
     }
 
     private void BtnCombineUnion_OnClick(object? sender, RoutedEventArgs e)
@@ -702,8 +708,14 @@ 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]), "intersection");
+        try
+        {
+            StartCombine(list, Convert.ToInt32(LstCustomers.SelectedItem.ToString().Split(" - ")[0]), "intersection");
+        }
+        catch
+        {
+                
+        }
     }
 
     private void BtnCombineSymmetricDifference_OnClick(object? sender, RoutedEventArgs e)