diff --git a/src/Nethermind/Nethermind.JsonRpc.Test/JsonRpcSocketsClientTests.cs b/src/Nethermind/Nethermind.JsonRpc.Test/JsonRpcSocketsClientTests.cs
index c3c6052db6c..373557181ae 100644
--- a/src/Nethermind/Nethermind.JsonRpc.Test/JsonRpcSocketsClientTests.cs
+++ b/src/Nethermind/Nethermind.JsonRpc.Test/JsonRpcSocketsClientTests.cs
@@ -3,6 +3,7 @@
 
 using System;
 using System.Collections.Generic;
+using System.IO;
 using System.Linq;
 using System.Net;
 using System.Net.Sockets;
@@ -128,7 +129,7 @@ static async Task<int> CountNumberOfMessages(Socket socket, CancellationToken to
                 }
 
                 disposeCount.Should().Be(messageCount);
-                cts.Cancel();
+                await cts.CancelAsync();
 
                 return messageCount;
             });
@@ -223,7 +224,7 @@ async Task<int> ReadMessages(Socket socket, IList<byte[]> receivedMessages, Canc
                     }
                 }
                 stream.Close();
-                cts.Cancel();
+                await cts.CancelAsync();
 
                 return messageCount;
             });
@@ -298,7 +299,7 @@ public async Task Can_send_multiple_messages(int messageCount)
                     await client.SendJsonRpcResult(result);
                     await Task.Delay(100);
                 }
-                cts.Cancel();
+                await cts.CancelAsync();
 
                 return messageCount;
             });
@@ -340,7 +341,7 @@ public async Task Can_send_collections(int elements)
                 await client.SendJsonRpcResult(result);
 
                 await Task.Delay(100);
-                cts.Cancel();
+                await cts.CancelAsync();
             });
 
             await Task.WhenAll(sendCollection, server);
@@ -380,7 +381,7 @@ public async Task Stops_on_limited_body_size(int maxByteCount)
                 int sent = await client.SendJsonRpcResult(result);
 
                 await Task.Delay(100);
-                cts.Cancel();
+                await cts.CancelAsync();
 
                 return sent;
             });
@@ -391,6 +392,27 @@ public async Task Stops_on_limited_body_size(int maxByteCount)
             Assert.That(received, Is.LessThanOrEqualTo(Math.Min(sent, maxByteCount)));
         }
 
+        [Test]
+        public async Task Can_serialize_collection()
+        {
+            await using MemoryMessageStream stream = new();
+            EthereumJsonSerializer ethereumJsonSerializer = new();
+            using JsonRpcSocketsClient<MemoryMessageStream> client = new(
+                clientName: "TestClient",
+                stream: stream,
+                endpointType: RpcEndpoint.Ws,
+                jsonRpcProcessor: null!,
+                jsonRpcLocalStats: new NullJsonRpcLocalStats(),
+                jsonSerializer: ethereumJsonSerializer,
+                maxBatchResponseBodySize: 10_000
+            );
+            using JsonRpcResult result = JsonRpcResult.Collection(RandomBatchResult(10, 100));
+            await client.SendJsonRpcResult(result);
+            stream.Seek(0, SeekOrigin.Begin);
+            JsonRpcSuccessResponse[]? response = ethereumJsonSerializer.Deserialize<JsonRpcSuccessResponse[]>(stream);
+            response.Should().NotContainNulls();
+        }
+
         private static async Task<T> OneShotServer<T>(string uri, Func<WebSocket, Task<T>> func)
         {
             using HttpListener httpListener = new();
diff --git a/src/Nethermind/Nethermind.JsonRpc.Test/MemoryMessageStream.cs b/src/Nethermind/Nethermind.JsonRpc.Test/MemoryMessageStream.cs
new file mode 100644
index 00000000000..f1bc3b2a87b
--- /dev/null
+++ b/src/Nethermind/Nethermind.JsonRpc.Test/MemoryMessageStream.cs
@@ -0,0 +1,30 @@
+// SPDX-FileCopyrightText: 2024 Demerzel Solutions Limited
+// SPDX-License-Identifier: LGPL-3.0-only
+
+using System;
+using System.IO;
+using System.Threading.Tasks;
+using Nethermind.Sockets;
+
+namespace Nethermind.JsonRpc.Test;
+
+public class MemoryMessageStream : MemoryStream, IMessageBorderPreservingStream
+{
+    private static readonly byte Delimiter = Convert.ToByte('\n');
+
+    public Task<ReceiveResult?> ReceiveAsync(ArraySegment<byte> buffer)
+    {
+        int read = Read(buffer.AsSpan());
+        return Task.FromResult<ReceiveResult?>(new ReceiveResult
+        {
+            Read = read,
+            EndOfMessage = read > 0 && buffer[read - 1] == Delimiter
+        });
+    }
+
+    public Task<int> WriteEndOfMessageAsync()
+    {
+        WriteByte(Delimiter);
+        return Task.FromResult(1);
+    }
+}
diff --git a/src/Nethermind/Nethermind.JsonRpc/WebSockets/JsonRpcSocketsClient.cs b/src/Nethermind/Nethermind.JsonRpc/WebSockets/JsonRpcSocketsClient.cs
index 1176e351741..3cf54185a5e 100644
--- a/src/Nethermind/Nethermind.JsonRpc/WebSockets/JsonRpcSocketsClient.cs
+++ b/src/Nethermind/Nethermind.JsonRpc/WebSockets/JsonRpcSocketsClient.cs
@@ -138,7 +138,7 @@ public virtual async Task<int> SendJsonRpcResult(JsonRpcResult result)
                             responseSize += 1;
                         }
                         isFirst = false;
-                        responseSize += (int)await _jsonSerializer.SerializeAsync(_stream, result.Response, indented: false);
+                        responseSize += (int)await _jsonSerializer.SerializeAsync(_stream, entry.Response, indented: false);
                         _ = _jsonRpcLocalStats.ReportCall(entry.Report);
 
                         // We reached the limit and don't want to responded to more request in the batch