diff --git a/ChatController/ChatMainControl.xaml.cs b/ChatController/ChatMainControl.xaml.cs
index aff9bc7..d59ed7f 100644
--- a/ChatController/ChatMainControl.xaml.cs
+++ b/ChatController/ChatMainControl.xaml.cs
@@ -408,7 +408,7 @@ namespace ChatController
 
             contact.IsNewMessage = false;
 
-            var shouldChangeIcon = _ContactList.Any(contactDependencyObject => contactDependencyObject.Contact?.IsNewMessage ?? false);
+            var shouldChangeIcon = _ContactList.Any(contactDependencyObject => contactDependencyObject?.Contact?.IsNewMessage ?? false);
             if(shouldChangeIcon)
             {
                 ContainingWindow.Icon = Utils.ConvertIconToImageSource(Resource.ownchat_favicon);