site crash with update to 9.1

Hi!

Today we updated to Pixelyoursite form 9.0 to 9.1 which crashed our wordpress backen site with the following error:

Howdy!

Since WordPress 5.2 there is a built-in feature that detects when a plugin or theme causes a fatal error on your site, and notifies you with this automated email.

In this case, WordPress caught an error with one of your plugins, PixelYourSite.

First, visit your website (https://www.magped.us/) and check for any visible issues. Next, visit the page where the error was caught (https://www.magped.us/wp-admin/admin.php?page=wc-settings&tab=wc_aelia_foundation_classes&section=aelia-premium-plugin-updater) and check for any visible issues.

Please contact your host for assistance with investigating this issue further.

If your site appears broken and you can't access your dashboard normally, WordPress now has a special "recovery mode". This lets you safely login to your dashboard and investigate further.

https://www.magped.us/wp-login.php?action=enter_recovery_mode&rm_token=nfQt7BALQ3kiSntJWUmTSC&rm_key=m4OmRChTFGICyL0RPIk3tn

To keep your site safe, this link will expire in 1 day. Don't worry about that, though: a new link will be emailed to you if the error occurs again after it expires.

When seeking help with this issue, you may be asked for some of the following information:
WordPress version 6.0
Active theme: magped Flatsome Child (version 1.0)
Current plugin: PixelYourSite (version 9.1.0)
PHP version 8.0.12

Error Details
=============
An error of type E_ERROR was caused in line 24 of the file /www/magpedus_796/public/wp-content/plugins/pixelyoursite/includes/functions-migrate.php. Error message: Uncaught Error: Undefined constant "PixelYourSite\PYS_VERSION" in /www/magpedus_796/public/wp-content/plugins/pixelyoursite/includes/functions-migrate.php:24
Stack trace:
#0 /www/magpedus_796/public/wp-content/plugins/pixelyoursite/includes/class-pys.php(161): PixelYourSite\maybeMigrate()
#1 /www/magpedus_796/public/wp-includes/class-wp-hook.php(307): PixelYourSite\PYS->afterInit('')
#2 /www/magpedus_796/public/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters(NULL, Array)
#3 /www/magpedus_796/public/wp-includes/plugin.php(476): WP_Hook->do_action(Array)
#4 /www/magpedus_796/public/wp-settings.php(598): do_action('init')
#5 /www/magpedus_796/public/wp-config.php(88): require_once('/www/magpedus_7...')
#6 /www/magpedus_796/public/wp-load.php(50): require_once('/www/magpedus_7...')
#7 /www/magpedus_796/public/wp-admin/admin.php(34): require_once('/www/magpedus_7...')
#8 {main}
thrown

hope you can help us on that issue. We experienced this on https://www.magepd.com and https://www.mapged.us and also on our integration site int.magped.com which runs under PHP 7.4.x.

many thanks

:: Paul

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