diff --git a/src/GraphQL.AspNetCore3/WebSockets/GraphQLWs/SubscriptionServer.cs b/src/GraphQL.AspNetCore3/WebSockets/GraphQLWs/SubscriptionServer.cs
index 8e75172..d858588 100644
--- a/src/GraphQL.AspNetCore3/WebSockets/GraphQLWs/SubscriptionServer.cs
+++ b/src/GraphQL.AspNetCore3/WebSockets/GraphQLWs/SubscriptionServer.cs
@@ -182,10 +182,9 @@ await Connection.SendMessageAsync(new OperationMessage {
     /// <inheritdoc/>
     protected override async Task<ExecutionResult> ExecuteRequestAsync(OperationMessage message)
     {
-        var request = Serializer.ReadNode<GraphQLRequest>(message.Payload);
 #pragma warning disable CA2208 // Instantiate argument exceptions correctly
-        if (request == null)
-            throw new ArgumentNullException(nameof(message) + "." + nameof(OperationMessage.Payload));
+        var request = Serializer.ReadNode<GraphQLRequest>(message.Payload)
+            ?? throw new ArgumentNullException(nameof(message) + "." + nameof(OperationMessage.Payload));
 #pragma warning restore CA2208 // Instantiate argument exceptions correctly
         using var scope = ServiceScopeFactory.CreateScope();
         try {
diff --git a/src/GraphQL.AspNetCore3/WebSockets/SubscriptionsTransportWs/SubscriptionServer.cs b/src/GraphQL.AspNetCore3/WebSockets/SubscriptionsTransportWs/SubscriptionServer.cs
index 4d41a11..2e72846 100644
--- a/src/GraphQL.AspNetCore3/WebSockets/SubscriptionsTransportWs/SubscriptionServer.cs
+++ b/src/GraphQL.AspNetCore3/WebSockets/SubscriptionsTransportWs/SubscriptionServer.cs
@@ -162,10 +162,9 @@ await Connection.SendMessageAsync(new OperationMessage {
     /// <inheritdoc/>
     protected override async Task<ExecutionResult> ExecuteRequestAsync(OperationMessage message)
     {
-        var request = Serializer.ReadNode<GraphQLRequest>(message.Payload);
 #pragma warning disable CA2208 // Instantiate argument exceptions correctly
-        if (request == null)
-            throw new ArgumentNullException(nameof(message) + "." + nameof(OperationMessage.Payload));
+        var request = Serializer.ReadNode<GraphQLRequest>(message.Payload)
+            ?? throw new ArgumentNullException(nameof(message) + "." + nameof(OperationMessage.Payload));
 #pragma warning restore CA2208 // Instantiate argument exceptions correctly
         using var scope = ServiceScopeFactory.CreateScope();
         try {
diff --git a/src/Tests/Middleware/WebSocketTests.cs b/src/Tests/Middleware/WebSocketTests.cs
index 72c764c..90123e0 100644
--- a/src/Tests/Middleware/WebSocketTests.cs
+++ b/src/Tests/Middleware/WebSocketTests.cs
@@ -9,10 +9,8 @@ public class WebSocketTests : IDisposable
 
     private void Configure(Action<GraphQLHttpMiddlewareOptions>? configureOptions = null, Action<IServiceCollection>? configureServices = null)
     {
-        if (configureOptions == null)
-            configureOptions = _ => { };
-        if (configureServices == null)
-            configureServices = _ => { };
+        configureOptions ??= _ => { };
+        configureServices ??= _ => { };
 
         var hostBuilder = new WebHostBuilder();
         hostBuilder.ConfigureServices(services => {