NoMethodError: undefined method `execute' for nil:NilClass in JenkinsService

https://sentry.gitlap.com/gitlab/gitlabcom/issues/14356/

NoMethodError: undefined method `execute' for nil:NilClass
Did you mean?  exec
  app/models/project_services/jenkins_service.rb:32:in `execute'
    service_hook.execute(data, "#{data[:object_kind]}_hook")
  app/workers/project_service_worker.rb:7:in `perform'
    Service.find(hook_id).execute(data)
  lib/gitlab/sidekiq_middleware/request_store_middleware.rb:6:in `call'
    yield
  lib/gitlab/metrics/sidekiq_middleware.rb:13:in `block in call'
    trans.run { yield }
  lib/gitlab/metrics/transaction.rb:49:in `run'
    yield
...
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