From da7959c2e8aee0efb0bd1c7b217eb896e30fa8ea Mon Sep 17 00:00:00 2001
From: Tatsuhiro Tsujikawa <tatsuhiro.t@gmail.com>
Date: Sun, 15 Nov 2020 11:18:32 +0900
Subject: [PATCH] nghttpx: Deal with the case when h2 backend is retired before
 it is initialized

---
 src/shrpx_http2_session.cc | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/shrpx_http2_session.cc b/src/shrpx_http2_session.cc
index 6043a9db..2f9d2e50 100644
--- a/src/shrpx_http2_session.cc
+++ b/src/shrpx_http2_session.cc
@@ -2379,6 +2379,10 @@ void Http2Session::check_retire() {
 
   ev_prepare_stop(conn_.loop, &prep_);
 
+  if (!session_) {
+    return;
+  }
+
   auto last_stream_id = nghttp2_session_get_last_proc_stream_id(session_);
   nghttp2_submit_goaway(session_, NGHTTP2_FLAG_NONE, last_stream_id,
                         NGHTTP2_NO_ERROR, nullptr, 0);