From 79a7b36d207c9142468a7ea33695a14181a9fd24 Mon Sep 17 00:00:00 2001
From: "Roger A. Light" <roger@atchoo.org>
Date: Thu, 19 Apr 2018 20:53:38 +0100
Subject: [PATCH] Don't derefence a null message.

---
 lib/messages_mosq.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/messages_mosq.c b/lib/messages_mosq.c
index e6baeb67..a5376e9e 100644
--- a/lib/messages_mosq.c
+++ b/lib/messages_mosq.c
@@ -178,7 +178,7 @@ void message__reconnect_reset(struct mosquitto *mosq)
 			* whatever the client has got. */
 		}
 		prev = message;
-		message = message->next;
+		if(message) message = message->next;
 	}
 	mosq->in_messages_last = prev;
 	pthread_mutex_unlock(&mosq->in_message_mutex);