From 53dda488338412b9a9f068ea7915ebef9d4146ae Mon Sep 17 00:00:00 2001
From: Feng Lee <feng@emqx.io>
Date: Mon, 14 Oct 2019 17:01:41 +0800
Subject: [PATCH] Fix the 'function_clause' error when session is undefined

---
 src/emqx_channel.erl | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/emqx_channel.erl b/src/emqx_channel.erl
index 1160c460d..5f4821897 100644
--- a/src/emqx_channel.erl
+++ b/src/emqx_channel.erl
@@ -153,6 +153,8 @@ attrs(session, #channel{session = Session}) ->
 attrs(Key, Channel) -> info(Key, Channel).
 
 -spec(stats(channel()) -> emqx_types:stats()).
+stats(#channel{pub_stats = PubStats, session = undefined}) ->
+    maps:to_list(PubStats);
 stats(#channel{pub_stats = PubStats, session = Session}) ->
     maps:to_list(PubStats) ++ emqx_session:stats(Session).