TypeError: addslashes(): Argument #1 ($string) must be of type string after upgrade Magento 2.4.3 to 2.4.6

Question

TypeError: addslashes(): Argument #1 ($string) must be of type string, null given in vendor/magento/framework/Escaper.php:440

Answer 1

Without modify core code - simple update the core_config_data table with this sql statement:

UPDATE core_config_data SET value = 'welcome' WHERE path ='design/header/welcome'

Answer 2

Solution: Add the below line in the di.xml file.

<preference for="Magento\Theme\Block\Html\Header" type="Vendor\Packagename\Block\Html\Header" />

Create a new Header.php file under the Vendor\Packagename\Block\Html folder.

<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */

namespace Vendor\Packagename\Block\Html;

use Magento\Framework\App\ObjectManager;
use Magento\Framework\Escaper;
use Magento\Framework\View\Element\Template;
use Magento\Framework\View\Element\Template\Context;
use Magento\Store\Model\ScopeInterface;

/**
 * Html page header block
 *
 * @api
 * @since 100.0.2
 */
class Header extends \Magento\Theme\Block\Html\Header
{
    /**
     * @var Escaper
     */
    private $escaper;

    /**
     * @param Context $context
     * @param array $data
     * @param Escaper|null $escaper
     */
    public function __construct(
        Context $context,
        array $data = [],
        Escaper $escaper = null
    ) {
        parent::__construct($context, $data, $escaper);
        $this->escaper = $escaper ?: ObjectManager::getInstance()->get(Escaper::class);
    }

    /**
     * Current template name
     *
     * @var string
     */
    protected $_template = 'Magento_Theme::html/header.phtml';

    /**
     * Retrieve welcome text
     *
     * @return string
     */
    public function getWelcome()
    {
        if (empty($this->_data['welcome'])) {
            $this->_data['welcome'] = $this->_scopeConfig->getValue(
                'design/header/welcome',
                ScopeInterface::SCOPE_STORE
            );
        }
        return $this->escaper->escapeQuote(__($this->_data['welcome'])->render(), true);
    }
}

Answer 3

File : vendor/magento/module-theme/Block/Html/Header.php

Replace from

$this->_data['welcome'] = $this->_scopeConfig->getValue('design/header/welcome', ScopeInterface::SCOPE_STORE );

To

$this->_data['welcome'] = (string)$this->_scopeConfig->getValue( 'design/header/welcome', ScopeInterface::SCOPE_STORE );

https://github.com/magento/magento2/issues/37208

Answer 4

The code in question is designed to escape quotes, and it uses the addslashes() function to add backslashes before characters that need to be escaped. If $addSlashes is set to true, the addslashes() function is called on $data.

To avoid the TypeError, you could add a conditional check to ensure $data is not null before calling addslashes():

Go to file /public_html/vendor/magento/framework/Escaper.php > go to line 437 and replace this code

public function escapeQuote($data, $addSlashes = false) { if ($addSlashes === true) { $data = addslashes($data); } return htmlspecialchars($data, $this->htmlSpecialCharsFlag, null, false); }

With this code

public function escapeQuote($data, $addSlashes = false) { if ($data !== null) { if ($addSlashes === true) { $data = addslashes($data); } } else { // Optionally, handle null values here, or log them for debugging $data = ''; } return htmlspecialchars($data, $this->htmlSpecialCharsFlag, null, false); }

Save file php bin/magento cache:clean php bin/magento cache:flush php bin/magento setup:di:compile

Issue Resolved!