# "Customers have also seen" plugin can not be installed
**URL:** https://forum.shopware.com/t/customers-have-also-seen-plugin-can-not-be-installed/105256
**Category:** General Questions (EN)
**Tags:** general
**Created:** [20. September 2024 um 08:40 UTC](https://forum.shopware.com/t/customers-have-also-seen-plugin-can-not-be-installed/105256 "2024-09-20T08:40:27Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@anatol](https://forum.shopware.com/u/anatol)
#### Post date: [20. September 2024 um 08:40 UTC](https://forum.shopware.com/t/customers-have-also-seen-plugin-can-not-be-installed/105256/1 "2024-09-20T08:40:27Z")
The plugin [Customers have also seen](https://store.shopware.com/en/phpsc28960537471m/customers-have-also-seen.html#hook-manufacturer) can not be installed in Shopware v6.6.3.1
Error:
> Internal Server Error
>
> An exception occurred while executing a query: SQLSTATE[23000]: Integrity constraint violation: 1452 Cannot add or update a child row: a foreign key constraint fails (`sw6_mydb`.`#sql-1_61689`, CONSTRAINT `fk.customers_have_also_seen.target_product_id` FOREIGN KEY (`target_product_id`) REFERENCES `product` (`id`) ON DELETE CASCADE ON UPDATE CASCADE)
Error in Prod Log:
> Uncaught PHP Exception Doctrine\DBAL\Exception\ForeignKeyConstraintViolationException: „An exception occurred while executing a query: SQLSTATE[23000]: Integrity constraint violation: 1452 Cannot add or update a child row: a foreign key constraint fails (`sw6_mydb`.`#sql-1_61852`, CONSTRAINT `fk.customers_have_also_seen.target_product_id` FOREIGN KEY (`target_product_id`) REFERENCES `product` (`id`) ON DELETE CASCADE ON UPDATE CASCADE)“ at ExceptionConverter.php line 56 {„exception“:„[object] (Doctrine\DBAL\Exception\ForeignKeyConstraintViolationException(code: 1452): An exception occurred while executing a query: SQLSTATE[23000]: Integrity constraint violation: 1452 Cannot add or update a child row: a foreign key constraint fails (`sw6_mydb`.`#sql-1_61852`, CONSTRAINT `fk.customers_have_also_seen.target_product_id` FOREIGN KEY (`target_product_id`) REFERENCES `product` (`id`) ON DELETE CASCADE ON UPDATE CASCADE) at /var/www/vhosts/myproject.de/httpdocs/vendor/doctrine/dbal/src/Driver/API/MySQL/ExceptionConverter.php:56)\n[previous exception] [object] (Doctrine\DBAL\Driver\PDO\Exception(code: 1452): SQLSTATE[23000]: Integrity constraint violation: 1452 Cannot add or update a child row: a foreign key constraint fails (`sw6_mydb`.`#sql-1_61852`, CONSTRAINT `fk.customers_have_also_seen.target_product_id` FOREIGN KEY (`target_product_id`) REFERENCES `product` (`id`) ON DELETE CASCADE ON UPDATE CASCADE) at /var/www/vhosts/myproject.de/httpdocs/vendor/doctrine/dbal/src/Driver/PDO/Exception.php:28)\n[previous exception] [object] (PDOException(code: 23000): SQLSTATE[23000]: Integrity constraint violation: 1452 Cannot add or update a child row: a foreign key constraint fails (`sw6_mydb`.`#sql-1_61852`, CONSTRAINT `fk.customers_have_also_seen.target_product_id` FOREIGN KEY (`target_product_id`) REFERENCES `product` (`id`) ON DELETE CASCADE ON UPDATE CASCADE) at /var/www/vhosts/myproject.de/httpdocs/vendor/doctrine/dbal/src/Driver/PDO/Connection.php:33)“}
---
### Author:  [@EikeBrandtWarneke](https://forum.shopware.com/u/EikeBrandtWarneke)
#### Post date: [20. September 2024 um 09:22 UTC](https://forum.shopware.com/t/customers-have-also-seen-plugin-can-not-be-installed/105256/2 "2024-09-20T09:22:14Z")
1. Please do not post the same question in multiple languages
2. You should contact the extension partner directly. I highly doubt that he is active in the forum.
Kind regards
---
### Author:  [@anatol](https://forum.shopware.com/u/anatol)
#### Post date: [20. September 2024 um 09:24 UTC](https://forum.shopware.com/t/customers-have-also-seen-plugin-can-not-be-installed/105256/3 "2024-09-20T09:24:56Z")
> [@EikeBrandtWarneke](#):
>
> extension partner
How to contact the extension partner? On the [extension page](https://store.shopware.com/en/phpsc28960537471m/customers-have-also-seen.html#hook-manufacturer) I did not found any contacts.