yep

Shogi.UI/Pages/Home/Home.razor

@@ -26,9 +26,16 @@
 </main>
 
 @code {
-    bool welcomeModalIsVisible = false;
-    string activeSessionName = string.Empty;
-    ClientWebSocket socket = new ClientWebSocket();
+    private bool welcomeModalIsVisible;
+    private string activeSessionName;
+    private ClientWebSocket socket;
+    
+    public Home()
+    {
+        welcomeModalIsVisible = false;
+        activeSessionName = string.Empty;
+        socket = new ClientWebSocket();
+    }
 
     protected override async Task OnInitializedAsync()
     {
@@ -40,10 +47,11 @@
         }
     }
 
-    private void OnLoginChanged(object? sender, LoginEventArgs args)
+    private Task OnLoginChanged(LoginEventArgs args)
     {
         welcomeModalIsVisible = args.User == null;
         StateHasChanged();
+        return Task.CompletedTask;
     }
     private void OnChangeSession(SessionMetadata s)
     {