MaxListenersExceededWarning

[sergge1]

I am running MM v2.10.1
Today I have a look at terminal and have found an ERROR message (the full log show below). Error appeared just 50 minutes after the MM start (once per each start).
By step-by-step verification, I have identified that the error is caused by the MMM-mqtt module.

[23:40:52.148] [ERROR] (node:13645) MaxListenersExceededWarning: Possible EventEmitter memory leak detected. 11 message listeners added. Use emitter.setMaxListeners() to increase limit

Full terminal log

**pi@raspberrypi:~/MagicMirror $ sudo npm start**
[email protected] start /home/pi/MagicMirror
./run-start.sh
[22:50:42.019] [LOG]    Starting MagicMirror: v2.10.1
[22:50:42.036] [LOG]    Loading config ...
[22:50:42.059] [LOG]    Loading module helpers ...
[22:50:42.062] [LOG]    No helper found for module: alert.
[22:50:42.064] [LOG]    No helper found for module: clock.
[22:50:43.281] [LOG]    Initializing new module helper ...
[22:50:43.283] [LOG]    Module helper loaded: calendar
[22:50:43.287] [LOG]    No helper found for module: currentweather.
[22:50:43.289] [LOG]    No helper found for module: weatherforecast.
[22:50:43.430] [LOG]    Initializing new module helper ...
[22:50:43.432] [LOG]    Module helper loaded: newsfeed
[22:50:43.561] [LOG]    Initializing new module helper ...
[22:50:43.562] [LOG]    Module helper loaded: MMM-PIR-Sensor
[22:50:43.566] [LOG]    No helper found for module: MMM-SmartWebDisplay.
[22:50:44.144] [LOG]    Initializing new module helper ...
[22:50:44.145] [LOG]    Module helper loaded: MMM-mqtt
[22:50:44.360] [LOG]    Initializing new module helper ...
[22:50:44.361] [LOG]    Module helper loaded: MMM-Remote-Control
[22:50:44.362] [LOG]    All module helpers loaded.
[22:50:44.363] [LOG]    Starting server on port 8181 ... 
[22:50:44.376] [INFO]   You're using a full whitelist configuration to allow for all IPs
[22:50:44.393] [LOG]    Server started ...
[22:50:44.396] [LOG]    Connecting socket for: calendar
[22:50:44.397] [LOG]    Starting node helper for: calendar
[22:50:44.399] [LOG]    Connecting socket for: newsfeed
[22:50:44.401] [LOG]    Starting module: newsfeed
[22:50:44.402] [LOG]    Connecting socket for: MMM-PIR-Sensor
[22:50:44.403] [LOG]    Connecting socket for: MMM-mqtt
[22:50:44.405] [LOG]    MMM-mqtt started ...
[22:50:44.406] [LOG]    Connecting socket for: MMM-Remote-Control
[22:50:44.408] [LOG]    Starting node helper for: MMM-Remote-Control
[22:50:44.436] [LOG]    Sockets connected & modules started ...
[22:50:45.046] [LOG]    Launching application.
[22:50:52.218] [LOG]    Create new calendar fetcher for url: https://calendar.google.com/calendar......./basic.ics - Interval: 300000
[22:50:52.242] [LOG]    Create new calendar fetcher for url: https://calendar.google.com/calendar......./basic.ics - Interval: 300000
[22:50:52.248] [LOG]    Create new news fetcher for url: https://www..../rss/ - Interval: 300000
[22:50:52.367] [LOG]    Creating new MQTT client for url:  mqtt://localhost:1883
**[23:40:52.148] [ERROR]  (node:13645) MaxListenersExceededWarning: Possible EventEmitter memory leak detected. 11 message listeners added. Use emitter.setMaxListeners() to increase limit**

I am running MM on the following hardware/software:

Raspbian version

pi@raspberrypi:~/MagicMirror $ cat /etc/os-release
>PRETTY_NAME="Raspbian GNU/Linux 10 (buster)"
>NAME="Raspbian GNU/Linux"
VERSION_ID="10"
VERSION="10 (buster)"
VERSION_CODENAME=buster
ID=raspbian
ID_LIKE=debian

Linux core

pi@raspberrypi:~/MagicMirror $ uname -a
Linux raspberrypi 4.19.75-v7+ #1270 SMP Tue Sep 24 18:45:11 BST 2019 armv7l GNU/Linux

Hardware model

pi@raspberrypi:~/MagicMirror $ cat /proc/device-tree/model
Raspberry Pi 3 Model B Plus Rev 1.3

Node and NPM version

pi@raspberrypi:~ $ node -v v10.18.1
pi@raspberrypi:~ $ npm -v 6.13.4

List of active MM modules

- clock
- calendar
- currentweather
- weatherforecast
- newsfeed
- MMM-PIR-Sensor
- MMM-SmartWebDisplay
- MMM-mqtt
- MMM-Remote-Control