From e57fb22a3df10058cf6513ffd7b56e43e3bd3c42 Mon Sep 17 00:00:00 2001
From: Craig Tiller <craig.tiller@gmail.com>
Date: Wed, 9 Dec 2015 15:03:14 -0800
Subject: [PATCH] Add another NULL check

---
 src/core/iomgr/tcp_server_posix.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/core/iomgr/tcp_server_posix.c b/src/core/iomgr/tcp_server_posix.c
index cf729b6f284..0243ef8ae49 100644
--- a/src/core/iomgr/tcp_server_posix.c
+++ b/src/core/iomgr/tcp_server_posix.c
@@ -486,7 +486,7 @@ grpc_tcp_listener *grpc_tcp_server_add_port(grpc_tcp_server *s,
     addr_len = sizeof(addr4_copy);
   }
   sp = add_socket_to_server(s, fd, addr, addr_len);
-  sp->sibling = sp2;
+  if (sp) sp->sibling = sp2;
   if (sp2) sp2->is_sibling = 1;
 
 done: