NoMethodError: undefined method `projects_zones_clusters_create' for nil:NilClass

https://sentry.gitlab.net/gitlab/gitlabcom/issues/896352/

NoMethodError: undefined method `projects_zones_clusters_create' for nil:NilClass
  clusters/gcp/provision_service.rb:25:in `get_operation_id'
    operation = provider.api_client.projects_zones_clusters_create(
  clusters/gcp/provision_service.rb:11:in `execute'
    get_operation_id do |operation_id|
  cluster_provision_worker.rb:10:in `block (2 levels) in perform'
    Clusters::Gcp::ProvisionService.new.execute(provider) if cluster.gcp?
  active_support/core_ext/object/try.rb:16:in `try!'
    yield self
  active_support/core_ext/object/try.rb:8:in `try'
    try!(*a, &b) if a.empty? || respond_to?(a.first)
...
(55 additional frame(s) were not displayed)

undefined method `projects_zones_clusters_create' for nil:NilClass