diff --git a/MainWindow.axaml b/MainWindow.axaml
index cffbce1..b92b3cc 100644
--- a/MainWindow.axaml
+++ b/MainWindow.axaml
@@ -248,6 +248,13 @@
                                                  TextChanged="TbSettingsCustomerDescription_OnTextChanged"
                                                  x:Name="TbSettingsCustomerDescription" />
                                     </Grid>
+                                    <Grid ColumnDefinitions="150,*">
+                                        <Label Content="CSV-Trennzeichen" />
+                                        <TextBox Grid.Column="1" Watermark=","
+                                                 HorizontalAlignment="Stretch"
+                                                 TextChanged="TbSettingsCustomerCsvSeparator_OnTextChanged"
+                                                 x:Name="TbSettingsCustomerCsvSeparator" />
+                                    </Grid>
                                     <Grid ColumnDefinitions="150,*">
                                         <Label Content="Address-Patch-Info" />
                                         <TextBlock Grid.Column="1"
diff --git a/MainWindow.axaml.cs b/MainWindow.axaml.cs
index 376955e..44cfe28 100644
--- a/MainWindow.axaml.cs
+++ b/MainWindow.axaml.cs
@@ -230,6 +230,7 @@ public partial class MainWindow : Window
 
     private void TbSettingsCustomerName_OnTextChanged(object? sender, TextChangedEventArgs e)
     {
+        if (LstSettingsCustomers.SelectedIndex == null || LstSettingsCustomers.SelectedIndex == -1) return;
         foreach (var customer in Settings._instance.customers.customers)
             if (customer.ID == Settings._instance.customers.current)
                 customer.name = TbSettingsCustomerName.Text;
@@ -247,6 +248,7 @@ public partial class MainWindow : Window
             {
                 TbSettingsCustomerDescription.Text = customer.description;
                 TbSettingsCustomerName.Text = customer.name;
+                TbSettingsCustomerCsvSeparator.Text = customer.separator.ToString();
                 if (customer.patch != null)
                     TbSettingsCustomerPatchInfo.Text = customer.patch.ToString();
                 else
@@ -277,6 +279,7 @@ public partial class MainWindow : Window
 
     private void TbSettingsCustomerDescription_OnTextChanged(object? sender, TextChangedEventArgs e)
     {
+        if (LstSettingsCustomers.SelectedIndex == null || LstSettingsCustomers.SelectedIndex == -1) return;
         foreach (var customer in Settings._instance.customers.customers)
             if (customer.ID == Settings._instance.customers.current)
                 customer.description = TbSettingsCustomerDescription.Text;
@@ -417,4 +420,26 @@ public partial class MainWindow : Window
 
         Settings.Save();
     }
+
+    private void TbSettingsCustomerCsvSeparator_OnTextChanged(object? sender, TextChangedEventArgs e)
+    {
+        if (LstSettingsCustomers.SelectedIndex == null || LstSettingsCustomers.SelectedIndex == -1) return;
+        var sep = !string.IsNullOrEmpty(TbSettingsCustomerCsvSeparator.Text)
+            ? TbSettingsCustomerCsvSeparator.Text
+            : ",";
+        foreach (var customer in Settings._instance.customers.customers)
+            if (customer.ID == Settings._instance.customers.current)
+                try
+                {
+                    customer.separator = Convert.ToChar(sep);
+                }
+                catch (FormatException ex)
+                {
+                    MessageBox.Show(this, "Error while converting: " + ex.Message, "Could not parse");
+                }
+                catch (Exception ex)
+                {
+                    MessageBox.Show(this, "Unknown Error: " + ex.Message, "Error");
+                }
+    }
 }
\ No newline at end of file
diff --git a/Settings.cs b/Settings.cs
index 8a703bb..65ee9b8 100644
--- a/Settings.cs
+++ b/Settings.cs
@@ -74,6 +74,7 @@ public class Global
             Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData), "logofclient",
                 "global.config"), json);
     }
+
     public static void Load()
     {
         // if (!File.Exists(Path.Combine(
@@ -121,6 +122,7 @@ public class Customer
     public string name { get; set; } = "";
     public string description { get; set; } = "";
     public AddressPatch patch { get; set; }
+    public char separator { get; set; } = ',';
     public int ID { get; }
 
     public static int GetIDByCustomerListItem(string item_content)