diff --git a/SafeExamBrowser.UserInterface.Desktop/Windows/Taskbar.xaml.cs b/SafeExamBrowser.UserInterface.Desktop/Windows/Taskbar.xaml.cs
index 78ad173b..e1937348 100644
--- a/SafeExamBrowser.UserInterface.Desktop/Windows/Taskbar.xaml.cs
+++ b/SafeExamBrowser.UserInterface.Desktop/Windows/Taskbar.xaml.cs
@@ -91,7 +91,10 @@ namespace SafeExamBrowser.UserInterface.Desktop.Windows
 
 				if (forward)
 				{
-					SetFocusWithin(ApplicationStackPanel.Children[0]);
+					if (ApplicationStackPanel.Children.Count > 0)
+					{
+						SetFocusWithin(ApplicationStackPanel.Children[0]);
+					}
 				}
 				else
 				{
diff --git a/SafeExamBrowser.UserInterface.Mobile/Windows/Taskbar.xaml.cs b/SafeExamBrowser.UserInterface.Mobile/Windows/Taskbar.xaml.cs
index 24040923..18f4665b 100644
--- a/SafeExamBrowser.UserInterface.Mobile/Windows/Taskbar.xaml.cs
+++ b/SafeExamBrowser.UserInterface.Mobile/Windows/Taskbar.xaml.cs
@@ -90,7 +90,10 @@ namespace SafeExamBrowser.UserInterface.Mobile.Windows
 
 				if (fromTop)
 				{
-					ApplicationStackPanel.Children[0].Focus();
+					if (ApplicationStackPanel.Children.Count > 0)
+					{
+						ApplicationStackPanel.Children[0].Focus();
+					}
 				}
 				else
 				{