ArgumentError: comparison of Float with nil failed

https://sentry.gitlab.net/gitlab/gitlabcom/issues/1178268/

ArgumentError: comparison of Float with nil failed
  gitlab/request_context.rb:26:in `<'
    return if Gitlab::Metrics::System.real_time < request_deadline
  gitlab/request_context.rb:26:in `ensure_deadline_not_exceeded!'
    return if Gitlab::Metrics::System.real_time < request_deadline
  gitlab/gitaly_client.rb:163:in `execute'
    Gitlab::RequestContext.instance.ensure_deadline_not_exceeded!
  gitlab/gitaly_client.rb:155:in `block in streaming_call'
    response = self.execute(storage, service, rpc, request, remote_storage: remote_storage, timeout: timeout)
  gitlab/gitaly_client.rb:174:in `measure_timings'
    yield
...
(169 additional frame(s) were not displayed)

ArgumentError: comparison of Float with nil failed