GOautodial Open Source Omni-channel Contact Center Suite

Hi,

I am casual user of vicidial or goautodial and I run test goautodial server:
GoAutoDial CE 2.1 on ESXi virtual machine (Processors 1, Model Intel(R) Xeon(R) CPU E5620 @ 2.40GHz, CPU Speed 2.39 GHz, Cache Size, 12.00 MB...)
Avarege load is 0.18 or less becouase I am only user on system.

Every 5 minutes I get messages in root's mail:
U 1 root@go.goautodial.o Thu Jan 19 18:05 25/986 "Cron <munin@go> test -x /usr/bin/munin-cron && /usr/bin/munin-cron"
U 2 root@go.goautodial.o Thu Jan 19 18:10 25/986 "Cron <munin@go> test -x /usr/bin/munin-cron && /usr/bin/munin-cron"
U 3 root@go.goautodial.o Thu Jan 19 18:25 25/986 "Cron <munin@go> test -x /usr/bin/munin-cron && /usr/bin/munin-cron"
U 4 root@go.goautodial.o Thu Jan 19 18:30 25/986 "Cron <munin@go> test -x /usr/bin/munin-cron && /usr/bin/munin-cron"

with same content:

From munin@go.goautodial.org Thu Jan 19 18:40:02 2012
Date: Thu, 19 Jan 2012 18:40:01 +0100
From: root@go.goautodial.org (Cron Daemon)
To: root@go.goautodial.org
Subject: Cron <munin@go> test -x /usr/bin/munin-cron && /usr/bin/munin-cron
Content-Type: text/plain; charset=UTF-8
Auto-Submitted: auto-generated
X-Cron-Env: <MAILTO=root>
X-Cron-Env: <SHELL=/bin/sh>
X-Cron-Env: <HOME=/var/lib/munin>
X-Cron-Env: <PATH=/usr/bin:/bin>
X-Cron-Env: <LOGNAME=munin>
X-Cron-Env: <USER=munin>

Lock already exists: /var/run/munin/munin-update.lock. Dying.

Should I be worry because of this messages?
Yes, I can turn of munin from crontab,
[root@go ~]# crontab -l -u munin

1. munin

• * * * * /usr/bin/munin-cron

but will I solve problem with munin root mail and generate new problems? :)
Please, give me advice :)