LoadCustomerQuoteObserver.php

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<?php
namespace Magento\Checkout\Observer;

use Magento\Framework\Event\ObserverInterface;

class LoadCustomerQuoteObserver implements ObserverInterface
{
    protected $checkoutSession;

    protected $messageManager;

    public function __construct(
        \Magento\Checkout\Model\Session $checkoutSession,
        \Magento\Framework\Message\ManagerInterface $messageManager
    ) {
        $this->checkoutSession = $checkoutSession;
        $this->messageManager = $messageManager;
    }

    public function execute(\Magento\Framework\Event\Observer $observer)
    {
        try {
            $this->checkoutSession->loadCustomerQuote();
        } catch (\Magento\Framework\Exception\LocalizedException $e) {
            $this->messageManager->addErrorMessage($e->getMessage());
        } catch (\Exception $e) {
            $this->messageManager->addExceptionMessage($e, __('Load customer quote error'));
        }
    }
}