From 6e2e089323325082f927ea4476950ddfda9c81b7 Mon Sep 17 00:00:00 2001
From: Valeriob <valeriob@gmail.com>
Date: Mon, 28 Mar 2022 13:53:07 +0200
Subject: [PATCH] avoid NRE on disposed timers

---
 src/NetMQ/Core/IOObject.cs | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/NetMQ/Core/IOObject.cs b/src/NetMQ/Core/IOObject.cs
index dfc3071b1..fc4e4ca29 100644
--- a/src/NetMQ/Core/IOObject.cs
+++ b/src/NetMQ/Core/IOObject.cs
@@ -125,8 +125,7 @@ public virtual void OutCompleted(SocketError socketError, int bytesTransferred)
         /// <param name="id">an integer used to identify the timer</param>
         public virtual void TimerEvent(int id)
         {
-            Assumes.NotNull(m_handler);
-            m_handler.TimerEvent(id);
+            m_handler?.TimerEvent(id);
         }
 
         public void AddTimer(long timeout, int id)