diff --git a/Ink Canvas/MainWindow.xaml.cs b/Ink Canvas/MainWindow.xaml.cs
index ff05e6b..8051d4b 100644
--- a/Ink Canvas/MainWindow.xaml.cs	
+++ b/Ink Canvas/MainWindow.xaml.cs	
@@ -217,7 +217,8 @@ namespace Ink_Canvas
 
         private void Window_MouseWheel(object sender, MouseWheelEventArgs e)
         {
-            if (e.Delta >= 120)
+			if (StackPanelPPTControls.Visibility != Visibility.Visible || currentMode != 0) return;
+			if (e.Delta >= 120)
             {
                 BtnPPTSlidesUp_Click(BtnPPTSlidesUp, null);
             }