From e8ee75de6f8ff6604cdd882e819eff4df60fe73f Mon Sep 17 00:00:00 2001
From: Erik Mavrinac <erikmav@microsoft.com>
Date: Fri, 8 Mar 2024 15:01:40 -0800
Subject: [PATCH] Fast fix for NullRefException from FileAppender

---
 src/log4net/Appender/FileAppender.cs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/log4net/Appender/FileAppender.cs b/src/log4net/Appender/FileAppender.cs
index 4179190d..14a3e359 100644
--- a/src/log4net/Appender/FileAppender.cs
+++ b/src/log4net/Appender/FileAppender.cs
@@ -169,7 +169,7 @@ private LockStateException(SerializationInfo info, StreamingContext context) : b
       }
 
       private Stream m_realStream = null;
-      private LockingModelBase m_lockingModel = null;
+      private readonly LockingModelBase m_lockingModel;
       private int m_lockLevel = 0;
 
       public LockingStream(LockingModelBase locking)
@@ -1306,7 +1306,7 @@ protected override void Reset()
     protected override void OnClose()
     {
       base.OnClose();
-      m_lockingModel.OnClose();
+      m_lockingModel?.OnClose();
     }
 
     /// <summary>