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conflict with site after activation Variation Swatches for WooCommerce – Pro plugin



I just bought a Variation Swatches for WooCommerce – Pro plugin for life.
It works with the free version, but when I activate my pro version, my site (spacompany.be) goes down.
The theme I use is a customized one.

How can i solve this?



Hakik Zaman


Thank you for reaching out to us. Please kindly do a plugin compatibility check by doing these steps to identify the error :

=> Deactivate all of your additional plugins except WooCommerce and WooCommerce Variation Swatches Plugin.

=> See if the problem persists.

=> If the issue is resolved, you can tell which plugin might be the culprit of this error by activating your additional plugins one by one.

If the plugin conflict check doesn’t help, please record me reproducing your issue using a tool like this: https://www.useloom.com
It helps me to figure out the issue quickly.

And don’t forget to add your site login details in the site login details area. I’ll check what’s happening there.

You can add new users by going to Users > Add New set the user and password for us, set the role to admin, and set the info here.

And add your site URL, login username, and password in the site login area. Follow this guideline: https://www.useloom.com/share/27c1f2ac633c4060b2da883d946107d7

Hope to hear from you soon!

Thank you


Here the link of one of the products:



We can’t disable the swatches for those categories because we had to switch back to the free version.

We bought last week the pro version for life, but our site goes down when we active the pro.

We deactivated some other plugins as you requested, but our site AND WordPress backend went down completely. No access to our backend anymore.

Had to use our backup restore files.

Can we disable swatches for some categories with the free version.

Because your pro version does not work with our site, we would like to  have a refund ?


Best regards,


Mario Baert

Hakik Zaman


We are sorry for your inconvenience. Please confirm the following version of the tools you are using.

PHP Version?

WooCommerce Version?

What is your theme name and its version?

Thank you very much.


Our IT service found an error in our plugin that may cause this problem.

Can you please check?


PHP Fatal error: Uncaught Error: Undefined class constant ‘FILTER_QUERY_VAR_PREFIX’ in wp-content/plugins/woo-variation-swatches-pro/includes/class-<em>woo-variation-swatches-pro-blocks.php</em>:<em>69</em>

Hakik Zaman


Please update the WooCommerce to 8.0 or above.


Update the Variation Swatches free and pro to 2.029.

Then check whether it resolves your issue or not.

Hope to hear from you soon.

Thank You