diff --git a/SafeExamBrowser.UserInterface.Desktop/Controls/ActionCenter/NetworkControl.xaml.cs b/SafeExamBrowser.UserInterface.Desktop/Controls/ActionCenter/NetworkControl.xaml.cs
index 099b0239..0cb17a58 100644
--- a/SafeExamBrowser.UserInterface.Desktop/Controls/ActionCenter/NetworkControl.xaml.cs
+++ b/SafeExamBrowser.UserInterface.Desktop/Controls/ActionCenter/NetworkControl.xaml.cs
@@ -74,10 +74,13 @@ namespace SafeExamBrowser.UserInterface.Desktop.Controls.ActionCenter
 				Grid.Background = Brushes.Gray;
 				Task.Delay(100).ContinueWith((task) => Dispatcher.Invoke(() =>
 				{
-					var btn = WirelessNetworksStackPanel.Children[0] as NetworkButton;
-					if (btn != null)
+					if (WirelessNetworksStackPanel.Children.Count > 0)
 					{
-						btn.SetFocus();
+						var btn = WirelessNetworksStackPanel.Children[0] as NetworkButton;
+						if (btn != null)
+						{
+							btn.SetFocus();
+						}
 					}
 				}));
 			};
diff --git a/SafeExamBrowser.UserInterface.Desktop/Controls/Taskbar/NetworkControl.xaml.cs b/SafeExamBrowser.UserInterface.Desktop/Controls/Taskbar/NetworkControl.xaml.cs
index 4cc6793b..b9bf15d9 100644
--- a/SafeExamBrowser.UserInterface.Desktop/Controls/Taskbar/NetworkControl.xaml.cs
+++ b/SafeExamBrowser.UserInterface.Desktop/Controls/Taskbar/NetworkControl.xaml.cs
@@ -79,10 +79,13 @@ namespace SafeExamBrowser.UserInterface.Desktop.Controls.Taskbar
 				Button.Background = Brushes.LightGray;
 				Task.Delay(100).ContinueWith((task) => Dispatcher.Invoke(() =>
 				{
-					var btn = WirelessNetworksStackPanel.Children[0] as NetworkButton;
-					if (btn != null)
+					if (WirelessNetworksStackPanel.Children.Count > 0)
 					{
-						btn.SetFocus();
+						var btn = WirelessNetworksStackPanel.Children[0] as NetworkButton;
+						if (btn != null)
+						{
+							btn.SetFocus();
+						}
 					}
 				}));
 			};
diff --git a/SafeExamBrowser.UserInterface.Mobile/Controls/ActionCenter/NetworkControl.xaml.cs b/SafeExamBrowser.UserInterface.Mobile/Controls/ActionCenter/NetworkControl.xaml.cs
index 349418b4..9231578b 100644
--- a/SafeExamBrowser.UserInterface.Mobile/Controls/ActionCenter/NetworkControl.xaml.cs
+++ b/SafeExamBrowser.UserInterface.Mobile/Controls/ActionCenter/NetworkControl.xaml.cs
@@ -74,10 +74,13 @@ namespace SafeExamBrowser.UserInterface.Mobile.Controls.ActionCenter
 				Grid.Background = Brushes.Gray;
 				Task.Delay(100).ContinueWith((task) => Dispatcher.Invoke(() =>
 				{
-					var btn = WirelessNetworksStackPanel.Children[0] as NetworkButton;
-					if (btn != null)
+					if (WirelessNetworksStackPanel.Children.Count > 0)
 					{
-						btn.SetFocus();
+						var btn = WirelessNetworksStackPanel.Children[0] as NetworkButton;
+						if (btn != null)
+						{
+							btn.SetFocus();
+						}
 					}
 				}));
 			};
diff --git a/SafeExamBrowser.UserInterface.Mobile/Controls/Taskbar/NetworkControl.xaml.cs b/SafeExamBrowser.UserInterface.Mobile/Controls/Taskbar/NetworkControl.xaml.cs
index 7b21a7e3..89360a6a 100644
--- a/SafeExamBrowser.UserInterface.Mobile/Controls/Taskbar/NetworkControl.xaml.cs
+++ b/SafeExamBrowser.UserInterface.Mobile/Controls/Taskbar/NetworkControl.xaml.cs
@@ -79,10 +79,13 @@ namespace SafeExamBrowser.UserInterface.Mobile.Controls.Taskbar
 				Button.Background = Brushes.LightGray;
 				Task.Delay(100).ContinueWith((task) => Dispatcher.Invoke(() =>
 				{
-					var btn = WirelessNetworksStackPanel.Children[0] as NetworkButton;
-					if (btn != null)
+					if (WirelessNetworksStackPanel.Children.Count > 0)
 					{
-						btn.SetFocus();
+						var btn = WirelessNetworksStackPanel.Children[0] as NetworkButton;
+						if (btn != null)
+						{
+							btn.SetFocus();
+						}
 					}
 				}));
 			};