From 24d671704a73096efa0ea4275fb1454906a89776 Mon Sep 17 00:00:00 2001
From: Tom Henderson <tomh@tomh.org>
Date: Sat, 21 Aug 2021 18:02:01 -0700
Subject: [PATCH] spectrum: Avoid possible use of null pointer

---
 src/spectrum/model/three-gpp-channel-model.cc | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/spectrum/model/three-gpp-channel-model.cc b/src/spectrum/model/three-gpp-channel-model.cc
index b82c64f94..a2a954dc9 100644
--- a/src/spectrum/model/three-gpp-channel-model.cc
+++ b/src/spectrum/model/three-gpp-channel-model.cc
@@ -179,8 +179,12 @@ ThreeGppChannelModel::~ThreeGppChannelModel ()
 void
 ThreeGppChannelModel::DoDispose ()
 {
+  NS_LOG_FUNCTION (this);
   m_channelMap.clear ();
-  m_channelConditionModel->Dispose ();
+  if (m_channelConditionModel)
+    {
+      m_channelConditionModel->Dispose ();
+    }
   m_channelConditionModel = nullptr;
 }