ObjectManager.php

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<?php
namespace Magento\Framework\App;

use Magento\Framework\ObjectManager\FactoryInterface;

class ObjectManager extends \Magento\Framework\ObjectManager\ObjectManager
{
    protected static $_instance;

    public static function getInstance()
    {
        if (!self::$_instance instanceof \Magento\Framework\ObjectManagerInterface) {
            throw new \RuntimeException('ObjectManager isn\'t initialized');
        }
        return self::$_instance;
    }

    public static function setInstance(\Magento\Framework\ObjectManagerInterface $objectManager)
    {
        self::$_instance = $objectManager;
    }

    public function __construct(
        FactoryInterface $factory,
        \Magento\Framework\ObjectManager\ConfigInterface $config,
        array &$sharedInstances = []
    ) {
        parent::__construct($factory, $config, $sharedInstances);
        self::$_instance = $this;
    }
}