diff --git a/src/ScadaLink.CentralUI/Components/Pages/Design/TransportImport.razor.cs b/src/ScadaLink.CentralUI/Components/Pages/Design/TransportImport.razor.cs
index ace4412..b6078b3 100644
--- a/src/ScadaLink.CentralUI/Components/Pages/Design/TransportImport.razor.cs
+++ b/src/ScadaLink.CentralUI/Components/Pages/Design/TransportImport.razor.cs
@@ -126,6 +126,11 @@ public partial class TransportImport : ComponentBase
 
             await TryLoadAsync(passphrase: null);
         }
+        catch (ArgumentException)
+        {
+            // Encrypted bundle, no passphrase yet — expected. The wizard
+            // advances to the passphrase step when the user clicks Next.
+        }
         catch (Exception ex)
         {
             _errorMessage = $"Failed to read bundle: {ex.Message}";