sidekiq log

2019-05-20T07:41:26Z 17523 TID-1i71bw Mailchimp::SubscriberWorker JID-9c8032b49e8e6e1c30b56c00 INFO: start
2019-05-20T07:41:27Z 17523 TID-1i71bw Mailchimp::SubscriberWorker JID-9c8032b49e8e6e1c30b56c00 INFO: fail: 0.571 sec
2019-05-20T07:41:27Z 17523 TID-1i71bw WARN: {"retry"=>true, "queue"=>"mailchimp", "class"=>"Mailchimp::SubscriberWorker", "args"=>["create", 12101], "jid"=>"9c8032b49e8e6e1c30b56c00", "enqueued_at"=>1558338028.7402146, "error_message"=>"undefined method `[]' for nil:NilClass", "error_class"=>"NoMethodError", "failed_at"=>1558338057.194031, "retry_count"=>1, "retried_at"=>1558338087.1573184}
2019-05-20T07:41:27Z 17523 TID-1i71bw WARN: undefined method `[]' for nil:NilClass
2019-05-20T07:41:27Z 17523 TID-1i71bw WARN: /home/ugnpaul/ruby/lib/mailchimp.rb:8:in `list_id'
/home/ugnpaul/ruby/lib/mailchimp/subscriber.rb:8:in `initialize'
/home/ugnpaul/ruby/app/workers/mailchimp/subscriber_worker.rb:11:in `new'
/home/ugnpaul/ruby/app/workers/mailchimp/subscriber_worker.rb:11:in `create_action'
/home/ugnpaul/ruby/app/workers/mailchimp/subscriber_worker.rb:6:in `perform'