diff --git a/PCUT/PCUT/Package.appxmanifest b/PCUT/PCUT/Package.appxmanifest
index cccbb17..c03a692 100644
--- a/PCUT/PCUT/Package.appxmanifest
+++ b/PCUT/PCUT/Package.appxmanifest
@@ -9,7 +9,7 @@
   <Identity
     Name="ac171214-3336-4e02-845d-9bdc107cce71"
     Publisher="CN=pcut, O=PCUT, L=HN, S=HN, C=VN"
-    Version="1.3.1.0" />
+    Version="1.3.2.0" />
 
   <mp:PhoneIdentity PhoneProductId="ac171214-3336-4e02-845d-9bdc107cce71" PhonePublisherId="00000000-0000-0000-0000-000000000000"/>
 
diff --git a/PCUT/PCUT/Pages/DesignCenter/DesignCenterPage.xaml.cs b/PCUT/PCUT/Pages/DesignCenter/DesignCenterPage.xaml.cs
index 0dec773..ed593b3 100644
--- a/PCUT/PCUT/Pages/DesignCenter/DesignCenterPage.xaml.cs
+++ b/PCUT/PCUT/Pages/DesignCenter/DesignCenterPage.xaml.cs
@@ -149,7 +149,7 @@ namespace PCUT.Pages
             if (infos != null && infos.Any())
             {
                 var portInfos = new List<PortInfo>();
-                foreach (var info in infos)
+                foreach (var info in infos.Where(x => x.Id != null))
                 {
                     using (var deviceInfo = await SerialDevice.FromIdAsync(info.Id))
                     {
@@ -181,12 +181,12 @@ namespace PCUT.Pages
         private async void Refresh_Click(object sender, RoutedEventArgs e)
         {
             var deviceInfo = await GetPortInfos();
-            viewModel.Ports.Clear();
-            foreach (var info in deviceInfo)
-                viewModel.Ports.Add(info);
-            if (deviceInfo.Any())
-                viewModel.SelectedPortIndex = 0;
-        }
+                viewModel.Ports.Clear();
+                foreach (var info in deviceInfo)
+                    viewModel.Ports.Add(info);
+                if (deviceInfo.Any())
+                    viewModel.SelectedPortIndex = 0;
+            }
 
         private void TextBox_BeforeTextChanging(TextBox sender, TextBoxBeforeTextChangingEventArgs args)
         {