Magento Errors: Common Issues Explained - Measured Designs

Magento 2 Admin Login Fix: Cookie “admin” Has Been Rejected for Invalid Domain

Andrew Taylor — Thu, 28 May 2026 16:59:04 +0000

Fix the Magento 2 “Cookie admin has been rejected for invalid domain” error on staging and development websites. Learn how to update Magento base URLs, cookie settings and reCAPTCHA domains via CLI.

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Magento 2 – Deprecated Functionality: explode(): Passing null to parameter #2 ($string) of type string is deprecated in /vendor/magento/data-migration-tool/src/Migration/Model/PasswordVerifier.php on line 55

Andrew Taylor — Thu, 08 Aug 2024 12:33:14 +0000

When migrating a Magento 1.9 website to Magento 2.4.7-pt1 I encountered the error; Deprecated Functionality: explode(): Passing null to parameter #2 ($string) of type string is deprecated in /vendor/magento/data-migration-tool/src/Migration/Model/PasswordVerifier.php on line 55

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Magento 2 – TypeError: addslashes(): Argument #1 ($string) must be of type string upgrade error

Andrew Taylor — Tue, 24 Oct 2023 16:06:34 +0000

TypeError: addslashes(): Argument #1 ($string) must be of type string upgrade error.

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Magento 2 – Duplicate key name ‘WISHLIST_CUSTOMER_ID’, query was: ALTER TABLE wishlist

Andrew Taylor — Wed, 16 Aug 2023 12:16:19 +0000

Upgrading Magento 2 can be tricky. When recently updating a Magento 2.4.5-p2 website to 2.4.6-p2, I encountered the following error. 1061 Duplicate key name 'WISHLIST_CUSTOMER_ID'

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Magento 2 – Can’t mass update attributes product/edit/action/inventory.phtml

Andrew Taylor — Thu, 29 Oct 2020 11:35:13 +0000

When trying to mass update product attributes in Magento 2 admin, an empty page with just the store view option would appear and not the usual form. Products could be updated individually but not in bulk. A flaw in the Magento 1 to M2 migration script left out the setting for the minimum Quantity allowed in the shopping cart.

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Magento 2 – regenerating URL rewrites for products and categories

Andrew Taylor — Tue, 24 Mar 2020 19:21:28 +0000

A client recently had issues with category URLs being suffixed with numbers that couldn't be removed. This stemed from thousands of URL rewrites that were likely generated by flawed scripts. The website also had multiple store views despite only ever being a single site.

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Magento 2 – An error occurred while processing your form. Please try again later.

Andrew Taylor — Thu, 20 Feb 2020 17:11:32 +0000

After launching a new Magento 2 website the client reporting an issue submitting the contact form. The frontend error was a red message stating; 'An error occurred while processing your form. Please try again later.'

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Magento – Class does not exist but mentioned in eav_attribute.source_model

Andrew Taylor — Mon, 21 Jan 2019 13:43:51 +0000

When running the migration tool i hit the error 'Class does not exist but mentioned in eav_attribute.source_model'

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