diff --git a/SafeExamBrowser.UserInterface.Desktop/Windows/Taskbar.xaml.cs b/SafeExamBrowser.UserInterface.Desktop/Windows/Taskbar.xaml.cs
index 78ad173b..6e823b3e 100644
--- a/SafeExamBrowser.UserInterface.Desktop/Windows/Taskbar.xaml.cs
+++ b/SafeExamBrowser.UserInterface.Desktop/Windows/Taskbar.xaml.cs
@@ -89,7 +89,7 @@ namespace SafeExamBrowser.UserInterface.Desktop.Windows
 			{
 				Activate();
 
-				if (forward)
+				if (forward && ApplicationStackPanel.Children.Count > 0)
 				{
 					SetFocusWithin(ApplicationStackPanel.Children[0]);
 				}
diff --git a/SafeExamBrowser.UserInterface.Mobile/Windows/Taskbar.xaml.cs b/SafeExamBrowser.UserInterface.Mobile/Windows/Taskbar.xaml.cs
index 24040923..e64d3b8b 100644
--- a/SafeExamBrowser.UserInterface.Mobile/Windows/Taskbar.xaml.cs
+++ b/SafeExamBrowser.UserInterface.Mobile/Windows/Taskbar.xaml.cs
@@ -88,7 +88,7 @@ namespace SafeExamBrowser.UserInterface.Mobile.Windows
 			{
 				Activate();
 
-				if (fromTop)
+				if (fromTop && ApplicationStackPanel.Children.Count > 0)
 				{
 					ApplicationStackPanel.Children[0].Focus();
 				}