From 86ea9c844fd1d624ba2a039b816479c76c02a5d4 Mon Sep 17 00:00:00 2001
From: Feng <ery.lee@gmail.com>
Date: Wed, 21 Oct 2015 21:18:36 +0800
Subject: [PATCH] fix issue #350

---
 src/emqttd_sysmon.erl | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/emqttd_sysmon.erl b/src/emqttd_sysmon.erl
index 1031ee478..8ba4ff569 100644
--- a/src/emqttd_sysmon.erl
+++ b/src/emqttd_sysmon.erl
@@ -150,7 +150,11 @@ suppress(Key, SuccFun, State = #state{events = Events}) ->
     end.
 
 procinfo(Pid) ->
-    emqttd_vm:get_process_info(Pid) ++ emqttd_vm:get_process_gc(Pid).
+    case {emqttd_vm:get_process_info(Pid), emqttd_vm:get_process_gc(Pid)} of
+        {undefined, _} -> undefined;
+        {_, undefined} -> undefined;
+        {Info, GcInfo} -> Info ++ GcInfo
+    end.
 
 publish(Sysmon, WarnMsg) ->
     Msg = emqttd_message:make(sysmon, topic(Sysmon), iolist_to_binary(WarnMsg)),