From 7fac4479f7877d3f0e488237bc2233e832ae66f0 Mon Sep 17 00:00:00 2001
From: Chris Ross <Tratcher@Outlook.com>
Date: Fri, 1 Sep 2023 11:10:53 -0700
Subject: [PATCH] Update SendingHeadersEvent.cs (#513)

---
 .../CallHeaders/SendingHeadersEvent.cs                          | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Microsoft.Owin.Host.SystemWeb/CallHeaders/SendingHeadersEvent.cs b/src/Microsoft.Owin.Host.SystemWeb/CallHeaders/SendingHeadersEvent.cs
index eb1719a34..37f22349a 100644
--- a/src/Microsoft.Owin.Host.SystemWeb/CallHeaders/SendingHeadersEvent.cs
+++ b/src/Microsoft.Owin.Host.SystemWeb/CallHeaders/SendingHeadersEvent.cs
@@ -31,7 +31,7 @@ internal void Fire()
             for (int index = 0; index != count; ++index)
             {
                 Tuple<Action<object>, object> tuple = callbacks[count - index - 1];
-                tuple.Item1(tuple.Item2);
+                tuple?.Item1(tuple.Item2);
             }
         }
     }