From f6b0ad8873fde885e22d28d437a254b7e16b9d83 Mon Sep 17 00:00:00 2001
From: JianBo He <heeejianbo@gmail.com>
Date: Wed, 12 Feb 2020 11:29:51 +0800
Subject: [PATCH] Ignore some discarded exceptions

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

diff --git a/src/emqx_cm.erl b/src/emqx_cm.erl
index 8bc2fbd07..dd8b02e54 100644
--- a/src/emqx_cm.erl
+++ b/src/emqx_cm.erl
@@ -273,6 +273,8 @@ discard_session(ClientId) when is_binary(ClientId) ->
                       try
                           discard_session(ClientId, ChanPid)
                       catch
+                          _:{noproc,_}:_Stk -> ok;
+                          _:{{shutdown,_},_}:_Stk -> ok;
                           _:Error:_Stk ->
                               ?LOG(error, "Failed to discard ~p: ~p", [ChanPid, Error])
                       end