From 5db6394769e229139cbf8538ec73253ce76e735b Mon Sep 17 00:00:00 2001
From: Stephen Halter <halter73@gmail.com>
Date: Fri, 9 Nov 2018 12:40:51 -0800
Subject: [PATCH] Always decrement count on HTTP/2 stream completion (#3087)

#3079
---
 src/Kestrel.Core/Internal/Http2/Http2Connection.cs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/Kestrel.Core/Internal/Http2/Http2Connection.cs b/src/Kestrel.Core/Internal/Http2/Http2Connection.cs
index abb2ec13e1..a000db38c1 100644
--- a/src/Kestrel.Core/Internal/Http2/Http2Connection.cs
+++ b/src/Kestrel.Core/Internal/Http2/Http2Connection.cs
@@ -1045,11 +1045,11 @@ namespace Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http2
         {
             lock (_stateLock)
             {
+                _activeStreamCount--;
+
                 // Get, Add, Remove so the steam is always registered in at least one collection at a time.
                 if (_streams.TryGetValue(streamId, out var stream))
                 {
-                    _activeStreamCount--;
-
                     if (stream.IsDraining)
                     {
                         stream.DrainExpiration =