diff --git a/v2rayN/ServiceLib/ViewModels/AddServer2ViewModel.cs b/v2rayN/ServiceLib/ViewModels/AddServer2ViewModel.cs
index e98b12aab7..46f604b159 100644
--- a/v2rayN/ServiceLib/ViewModels/AddServer2ViewModel.cs
+++ b/v2rayN/ServiceLib/ViewModels/AddServer2ViewModel.cs
@@ -63,7 +63,7 @@ private async Task SaveServerAsync()
                 _noticeHandler?.Enqueue(ResUI.FillServerAddressCustom);
                 return;
             }
-            SelectedSource.coreType = (ECoreType)Enum.Parse(typeof(ECoreType), CoreType);
+            SelectedSource.coreType = CoreType.IsNullOrEmpty() ? null : (ECoreType)Enum.Parse(typeof(ECoreType), CoreType);
 
             if (ConfigHandler.EditCustomServer(_config, SelectedSource) == 0)
             {
diff --git a/v2rayN/ServiceLib/ViewModels/AddServerViewModel.cs b/v2rayN/ServiceLib/ViewModels/AddServerViewModel.cs
index 613ca69a60..7083d94b52 100644
--- a/v2rayN/ServiceLib/ViewModels/AddServerViewModel.cs
+++ b/v2rayN/ServiceLib/ViewModels/AddServerViewModel.cs
@@ -9,6 +9,7 @@ public class AddServerViewModel : MyReactiveObject
     {
         [Reactive]
         public ProfileItem SelectedSource { get; set; }
+
         [Reactive]
         public string? CoreType { get; set; }
 
@@ -82,7 +83,7 @@ private async Task SaveServerAsync()
                     return;
                 }
             }
-            SelectedSource.coreType = (ECoreType)Enum.Parse(typeof(ECoreType), CoreType);
+            SelectedSource.coreType = CoreType.IsNullOrEmpty() ? null : (ECoreType)Enum.Parse(typeof(ECoreType), CoreType);
 
             if (ConfigHandler.AddServer(_config, SelectedSource) == 0)
             {