From cd22f54f08312588bfa3aadba0aee67a7eb97f00 Mon Sep 17 00:00:00 2001
From: JianBo He <heeejianbo@163.com>
Date: Fri, 23 Jul 2021 14:46:10 +0800
Subject: [PATCH] fix(gw-sn): fix stats function call if session is undefied

---
 apps/emqx_gateway/src/mqttsn/emqx_sn_channel.erl | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/apps/emqx_gateway/src/mqttsn/emqx_sn_channel.erl b/apps/emqx_gateway/src/mqttsn/emqx_sn_channel.erl
index 9de86f101..e49a0dde8 100644
--- a/apps/emqx_gateway/src/mqttsn/emqx_sn_channel.erl
+++ b/apps/emqx_gateway/src/mqttsn/emqx_sn_channel.erl
@@ -183,6 +183,8 @@ info(ctx, #channel{ctx = Ctx}) ->
     Ctx.
 
 -spec(stats(channel()) -> emqx_types:stats()).
+stats(#channel{session = undefined})->
+    [];
 stats(#channel{session = Session})->
     emqx_session:stats(Session).