diff --git a/src/Avalonia.X11/X11Window.cs b/src/Avalonia.X11/X11Window.cs
index 982bca6439..211a8e4f79 100644
--- a/src/Avalonia.X11/X11Window.cs
+++ b/src/Avalonia.X11/X11Window.cs
@@ -1157,7 +1157,7 @@ namespace Avalonia.X11
         public ITextInputMethodImpl TextInputMethod => _ime;
 
         public void SetTransparencyLevelHint(WindowTransparencyLevel transparencyLevel) =>
-            _transparencyHelper.SetTransparencyRequest(transparencyLevel);
+            _transparencyHelper?.SetTransparencyRequest(transparencyLevel);
 
         public void SetWindowManagerAddShadowHint(bool enabled)
         {