Hi, im experimenting some error related to Swatches.

This is preventing the backend Catalog, Product and Categories to display, getting a 404 error. This is my PHP log:

[08-Jan-2019 18:12:29] WARNING: [pool www] child 14 said into stderr: "NOTICE: PHP message: PHP Fatal error:  Uncaught Error: Call to a member function isSwatchAttribute() on null in /usr/local/apache2/htdocs/vendor/magento/module-swatches/Helper/Data.php:518"

[08-Jan-2019 18:12:29] WARNING: [pool www] child 14 said into stderr: "Stack trace:"

[08-Jan-2019 18:12:29] WARNING: [pool www] child 14 said into stderr: "#0 /usr/local/apache2/htdocs/vendor/magento/module-swatches/Model/Plugin/EavAttribute.php(512): Magento\Swatches\Helper\Data->isSwatchAttribute(Object(Magento\Catalog\Model\ResourceModel\Eav\Attribute\Interceptor))"

[08-Jan-2019 18:12:29] WARNING: [pool www] child 14 said into stderr: "#1 /usr/local/apache2/htdocs/vendor/magento/framework/Interception/Interceptor.php(146): Magento\Swatches\Model\Plugin\EavAttribute->afterUsesSource(Object(Magento\Catalog\Model\ResourceModel\Eav\Attribute\Interceptor), false)"

[08-Jan-2019 18:12:29] WARNING: [pool www] child 14 said into stderr: "#2 /usr/local/apache2/htdocs/vendor/magento/framework/Interception/Interceptor.php(153): Magento\Catalog\Model\ResourceModel\Eav\Attribute\Interceptor->Magento\Framework\Interception\{closure}()"

[08-Jan-2019 18:12:29] WARNING: [pool www] child 14 said into stderr: "#3 /usr/local/apache2/htdocs/generated/code/Magento/Catalog/Model/ResourceModel/Eav/Attribute/Interceptor.php(1196): Magento\Catalog\Model\ResourceModel\Eav\Attribute\Interceptor->_..."

172.18.0.4 -  08/Jan/2019:18:12:02 +0000 "GET /index.php" 500

172.18.0.4 -  08/Jan/2019:18:12:29 +0000 "GET /index.php" 404

------ Same than this I found as a magento thread> https://community.magento.com/t5/Magento-2-x-Technical-Issues/Product-amp-Category-page-in-admin-is-not-working/td-p/108073

Im running Magento 2.3.0 with Amely v.1.0.7.

Hope you can help.

Hi, I tried the solution but it dose not fix the issue, keep getting error message:

-------

[09-Jan-2019 14:55:57] WARNING: [pool www] child 147 said into stderr: "NOTICE: PHP message: PHP Fatal error:  Uncaught Error: Call to a member function isSwatchAttribute() on null in /usr/local/apache2/htdocs/vendor/magento/module-swatches/Helper/Data.php:518"

[09-Jan-2019 14:55:57] WARNING: [pool www] child 147 said into stderr: "Stack trace:"

[09-Jan-2019 14:55:57] WARNING: [pool www] child 147 said into stderr: "#0 /usr/local/apache2/htdocs/vendor/magento/module-swatches/Model/Plugin/EavAttribute.php(512): Magento\Swatches\Helper\Data->isSwatchAttribute(Object(Magento\Catalog\Model\ResourceModel\Eav\Attribute\Interceptor))"

[09-Jan-2019 14:55:57] WARNING: [pool www] child 147 said into stderr: "#1 /usr/local/apache2/htdocs/vendor/magento/framework/Interception/Interceptor.php(146): Magento\Swatches\Model\Plugin\EavAttribute->afterUsesSource(Object(Magento\Catalog\Model\ResourceModel\Eav\Attribute\Interceptor), false)"

[09-Jan-2019 14:55:57] WARNING: [pool www] child 147 said into stderr: "#2 /usr/local/apache2/htdocs/vendor/magento/framework/Interception/Interceptor.php(153): Magento\Catalog\Model\ResourceModel\Eav\Attribute\Interceptor->Magento\Framework\Interception\{closure}()"

[09-Jan-2019 14:55:57] WARNING: [pool www] child 147 said into stderr: "#3 /usr/local/apache2/htdocs/generated/code/Magento/Catalog/Model/ResourceModel/Eav/Attribute/Interceptor.php(1196): Magento\Catalog\Model\ResourceModel\Eav\Attribute\Interceptor->_..."

172.18.0.4 -  09/Jan/2019:14:55:52 +0000 "GET /index.php" 500

172.18.0.4 -  09/Jan/2019:14:55:57 +0000 "GET /index.php" 404

----

Just to be celar, readme file for patch_for_magento_2.2+ said:

-----

- upload app folder to your magento root folder
- remove app/design/frontend/Mgs/claue/Magento_ConfigurableProduct
- remove app/design/frontend/Mgs/claue/Magento_Swatches/web/js
- run command: php bin/magento module:enable MGS_ClaueTheme
- run command: php bin/magento module:enable MGS_Landing
- run command: php bin/magento setup:upgrade
- remove var/*
- remove generated/code
- run deploy command: php bin/magento setup:static-content:deploy -f

In the: - run command: php bin/magento module:enable MGS_ClaueTheme of course I used MGS_AmelyTheme.

But in this cases > 

- remove app/design/frontend/Mgs/claue/Magento_ConfigurableProduct
- remove app/design/frontend/Mgs/claue/Magento_Swatches/web/js

I had no files or folder with those names to remove.

patch_for_magento_2.3+ was implemented

Hope you can help me fix this issue. 

Thanks, this is a developer state right now, and we are working over a Docker development. Im trying to make a package so you can run locally and try to solve this issue, if this is ok for you?