diff --git a/src/HassClient.WS/HASSClientWebSocket.cs b/src/HassClient.WS/HASSClientWebSocket.cs
index a093cda..4e13459 100644
--- a/src/HassClient.WS/HASSClientWebSocket.cs
+++ b/src/HassClient.WS/HASSClientWebSocket.cs
@@ -2,7 +2,6 @@
 using HassClient.Models;
 using HassClient.Serialization;
 using HassClient.WS.Messages;
-using HassClient.WS.Messages.Response;
 using HassClient.WS.Serialization;
 using Newtonsoft.Json;
 using Newtonsoft.Json.Linq;
diff --git a/src/HassClient.WS/Messages/Commands/Pipeline/PipelineRunMessage.cs b/src/HassClient.WS/Messages/Commands/Pipeline/PipelineRunMessage.cs
index 83b8bc3..b41bf6d 100644
--- a/src/HassClient.WS/Messages/Commands/Pipeline/PipelineRunMessage.cs
+++ b/src/HassClient.WS/Messages/Commands/Pipeline/PipelineRunMessage.cs
@@ -33,11 +33,13 @@ public PipelineRunMessage()
         /// <summary>
         /// ID of the pipeline.
         /// </summary>
+        [JsonProperty(NullValueHandling = NullValueHandling.Ignore)]
         public string Pipeline { get; set; }
 
         /// <summary>
         /// Unique id for conversation. <see href="https://developers.home-assistant.io/docs/intent_conversation_api#conversation-id"/>.
         /// </summary>
+        [JsonProperty(NullValueHandling = NullValueHandling.Ignore)]
         public string ConversationId { get; set; }
 
         /// <summary>