I recently updated Magento 2 to v2.3.5 and the Categories have a problem.

If I click the Save button in any Category I receive this message Categories error after Saved

Argument 1 passed to
must be of the type String, array given, 
called in 
/home/adminpsol2016/public_html/vendor/magento/module-catalog/Model/Category/FileInfo.php on line 167
  • 1
    Did you find any solution to above issue? I am getting same error after upgrade to Magento2.4.0.-p1
    – Tejas Shah
    Dec 10, 2020 at 13:36
  • Hi everyone same issue I'm facing. please do share if anyone has a solution. Apr 6, 2021 at 13:22

4 Answers 4


I have fixed this via a plugin. This has happened after the upgrade of Magento2.3.5 to Magento 2.4 when we select multiple products using select all checkbox and save category. Here is what I did -
Added adminhtml/di.xml

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
<type name="Magento\Catalog\Controller\Adminhtml\Category\Save">
    <plugin name="ControllerCategorySave" type="Vendor\Module\Plugin\CategoryPlugin" sortOrder="10"/>

create plugin file called - CategoryPlugin.php

namespace Vendor\Module\Plugin;
class CategoryPlugin
    public function beforeExecute(\Magento\Catalog\Controller\Adminhtml\Category\Save $subject)
        $categoryPostData = $subject->getRequest()->getPostValue();      
        $products = json_decode($categoryPostData['category_products'], true);
        $newValue = json_encode($products); 
        $subject->getRequest()->setPostValue('category_products', $newValue);   
        return $subject;       
  • Can you please share the complete plugin code?
    – omerts
    Apr 26, 2021 at 9:47
  • @Tejas Shah we are getting an issue - undefined array key "category_products" in /var/www/html/xyz/app/code/Company/Vendor/Plugin/CategoryPlugin.php on line 10 [] [] Feb 20, 2023 at 9:55

Had the same issue after upgrading to 2.4. For me the solution was to delete the \Magento\Catalog\Setup\Patch\Data\UpdateCustomLayoutAttributes patch from the patch_list table

DELETE FROM 'patch_list' WHERE patch_name = 'Magento\Catalog\Setup\Patch\Data\UpdateCustomLayoutAttributes'

Then run:

bin/magento setup:upgrade

Credit to: https://magento.stackexchange.com/a/307171/88690

  • correct query is delete FROM patch_list WHERE patch_name = 'Magento\\Catalog\\Setup\\Patch\\Data\\UpdateCustomLayoutAttributes' Nov 16, 2022 at 12:54

@Tejas Shah I have the same issue in Magento 2.4.3 but with your solution I get the notice: Notice: Undefined index: category_products in /var/www/clients/client1/web2/web/mag2/app/code/Wrj/CategorySave/Plugin/CategoryPlugin.php on line 11


This comment in https://github.com/magento/magento2/issues/33770#issuecomment-1133744546 fixed it for me.

While the error on the category page says Fileinfo.php, if I look into system.log I can see Duplicate entry errors as described in the github thread.

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