diff --git a/src/WPF/WPF.Viewer/Samples/Map/CreateDynamicBasemapGallery/CreateDynamicBasemapGallery.xaml.cs b/src/WPF/WPF.Viewer/Samples/Map/CreateDynamicBasemapGallery/CreateDynamicBasemapGallery.xaml.cs
index 78db2c31c8..0a95481ffd 100644
--- a/src/WPF/WPF.Viewer/Samples/Map/CreateDynamicBasemapGallery/CreateDynamicBasemapGallery.xaml.cs
+++ b/src/WPF/WPF.Viewer/Samples/Map/CreateDynamicBasemapGallery/CreateDynamicBasemapGallery.xaml.cs
@@ -62,6 +62,9 @@ private void BasemapStyleGallery_SelectionChanged(object sender, SelectionChange
 
         private void LoadButton_Click(object sender, RoutedEventArgs e)
         {
+            // Return if no basemap style is selected.
+            if (BasemapStyleGallery.SelectedItem == null) return;
+
             // Create a new basemap style parameters object.
             var basemapStyleParameters = new BasemapStyleParameters();
 
diff --git a/src/WinUI/ArcGIS.WinUI.Viewer/Samples/Map/CreateDynamicBasemapGallery/CreateDynamicBasemapGallery.xaml.cs b/src/WinUI/ArcGIS.WinUI.Viewer/Samples/Map/CreateDynamicBasemapGallery/CreateDynamicBasemapGallery.xaml.cs
index ce1034d1f0..f00b4b9d27 100644
--- a/src/WinUI/ArcGIS.WinUI.Viewer/Samples/Map/CreateDynamicBasemapGallery/CreateDynamicBasemapGallery.xaml.cs
+++ b/src/WinUI/ArcGIS.WinUI.Viewer/Samples/Map/CreateDynamicBasemapGallery/CreateDynamicBasemapGallery.xaml.cs
@@ -62,6 +62,9 @@ private void BasemapStyleGallery_SelectionChanged(object sender, SelectionChange
 
         private void LoadButton_Click(object sender, RoutedEventArgs e)
         {
+            // Return if no basemap style is selected.
+            if (BasemapStyleGallery.SelectedItem == null) return;
+
             // Create a new basemap style parameters object.
             var basemapStyleParameters = new BasemapStyleParameters();