Cannot retrieve cgroups information

Hi all,

I got a problem from filebeat to logstash.
The error message is as below:

[2018-07-21T13:27:39,692][DEBUG][logstash.instrument.periodicpoller.cgroup] Error, cannot retrieve cgroups information {:exception=>"NoMethodError", :message=>"undefined method `[]' for nil:NilClass"}

could someone help me to resolve it?

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