From 56acc82445b0d064525bfe72b2dfb69f1476bf5e Mon Sep 17 00:00:00 2001
From: Christian <christian.kratky@googlemail.com>
Date: Tue, 13 Mar 2018 20:23:22 +0100
Subject: [PATCH] Fix null ref in server when using interceptor

---
 .../MQTTnet.NetStandard/Server/MqttClientSessionsManager.cs     | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Frameworks/MQTTnet.NetStandard/Server/MqttClientSessionsManager.cs b/Frameworks/MQTTnet.NetStandard/Server/MqttClientSessionsManager.cs
index bc94e7f..fe57552 100644
--- a/Frameworks/MQTTnet.NetStandard/Server/MqttClientSessionsManager.cs
+++ b/Frameworks/MQTTnet.NetStandard/Server/MqttClientSessionsManager.cs
@@ -227,7 +227,7 @@ namespace MQTTnet.Server
             }
 
             var interceptorContext = new MqttApplicationMessageInterceptorContext(
-                senderClientSession.ClientId,
+                senderClientSession?.ClientId,
                 applicationMessage);
 
             interceptor(interceptorContext);