Link.php

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<?php
namespace Magento\Sales\Block\Guest;

use Magento\Customer\Model\Context;

class Link extends \Magento\Framework\View\Element\Html\Link\Current
{
    protected $httpContext;

    public function __construct(
        \Magento\Framework\View\Element\Template\Context $context,
        \Magento\Framework\App\DefaultPathInterface $defaultPath,
        \Magento\Framework\App\Http\Context $httpContext,
        array $data = []
    ) {
        parent::__construct($context, $defaultPath, $data);
        $this->httpContext = $httpContext;
    }

    protected function _toHtml()
    {
        if ($this->httpContext->getValue(Context::CONTEXT_AUTH)) {
            return '';
        }
        return parent::_toHtml();
    }
}