diff --git a/src/Wpf.Ui/Appearance/ApplicationAccentColorManager.cs b/src/Wpf.Ui/Appearance/ApplicationAccentColorManager.cs
index 9d021dd14..c8c5427a8 100644
--- a/src/Wpf.Ui/Appearance/ApplicationAccentColorManager.cs
+++ b/src/Wpf.Ui/Appearance/ApplicationAccentColorManager.cs
@@ -258,6 +258,13 @@ private static void UpdateColorResources(
         Color tertiaryAccent
     )
     {
+        // If the application is shut down (Application.Current becomes null), we cannot change resources, so return immediately.
+        var app = Application.Current;
+        if (app == null)
+        {
+            return;
+        }
+
         System.Diagnostics.Debug.WriteLine("INFO | SystemAccentColor: " + systemAccent, "Wpf.Ui.Accent");
         System.Diagnostics.Debug.WriteLine(
             "INFO | SystemAccentColorPrimary: " + primaryAccent,