diff --git a/QuickLook/ViewWindowManager.cs b/QuickLook/ViewWindowManager.cs
index 0c89e3d..6e9f463 100644
--- a/QuickLook/ViewWindowManager.cs
+++ b/QuickLook/ViewWindowManager.cs
@@ -107,15 +107,15 @@ namespace QuickLook
 
         public void SwitchPreview(string path = null)
         {
+            if (_viewerWindow.Visibility != Visibility.Visible)
+                return;
+
             if (string.IsNullOrEmpty(path))
                 path = NativeMethods.QuickLook.GetCurrentSelection();
 
             if (string.IsNullOrEmpty(path))
                 return;
 
-            if (_viewerWindow.Visibility != Visibility.Visible)
-                return;
-
             InvokePreview(path);
         }