From 6dffe61198cdc77bfc464ca15231fd6bedcf8a12 Mon Sep 17 00:00:00 2001
From: SutandoTsukai181 <52977072+SutandoTsukai181@users.noreply.github.com>
Date: Wed, 25 Oct 2023 09:07:28 +0300
Subject: [PATCH] Fix null check in PeriodicSender (#140)

Null pointer dereference caused by a refactor in a82f2cc45d00f368991b2f4eb8706abd84e246c0
---
 model/periodic-sender.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/model/periodic-sender.cc b/model/periodic-sender.cc
index 82b8929efd..0d384c9499 100644
--- a/model/periodic-sender.cc
+++ b/model/periodic-sender.cc
@@ -135,7 +135,7 @@ PeriodicSender::StartApplication(void)
     NS_LOG_FUNCTION(this);
 
     // Make sure we have a MAC layer
-    if (m_mac)
+    if (!m_mac)
     {
         // Assumes there's only one device
         Ptr<LoraNetDevice> loraNetDevice = m_node->GetDevice(0)->GetObject<LoraNetDevice>();