diff --git a/SyslogNet.Client/Serialization/SyslogRfc5424MessageSerializer.cs b/SyslogNet.Client/Serialization/SyslogRfc5424MessageSerializer.cs
index 301b059..748d32d 100644
--- a/SyslogNet.Client/Serialization/SyslogRfc5424MessageSerializer.cs
+++ b/SyslogNet.Client/Serialization/SyslogRfc5424MessageSerializer.cs
@@ -33,8 +33,8 @@ public void Serialize(SyslogMessage message, Stream stream)
 
 			writeStream(stream, Encoding.ASCII, messageBuilder.ToString());
 
-			var structuredData = message.StructuredDataElements.ToList();
-			if (structuredData.Any())
+			var structuredData = message.StructuredDataElements?.ToList();
+			if (structuredData != null && structuredData.Any())
 			{
 				// Structured data
 				foreach(StructuredDataElement sdElement in structuredData)