Environments page returns error 500

https://sentry.gitlab.net/gitlab/gitlabcom/issues/1562822/?referrer=gitlab_plugin

NoMethodError: private method `select' called for nil:NilClass
  gitlab/kubernetes/deployment.rb:70:in `block in filtered_pods_by_track'
    @pods.select { |pod| has_same_track?(pod) }
  gitlab/utils/strong_memoize.rb:30:in `strong_memoize'
    instance_variable_set(ivar(name), yield)
  gitlab/kubernetes/deployment.rb:69:in `filtered_pods_by_track'
    strong_memoize(:filtered_pods_by_track) do
  gitlab/kubernetes/deployment.rb:48:in `created_instances'
    filtered_pods_by_track.map do |pod|
  gitlab/kubernetes/deployment.rb:75:in `instances'
    created_instances + not_created_instances
...
(178 additional frame(s) were not displayed)

NoMethodError: private method `select' called for nil:NilClass

Related Support Tickets (internal)

1. https://gitlab.zendesk.com/agent/tickets/154685