Crashing website on version 7.6.13

Hello, the plugin was working without any problem in version 7.6.12
But after updating to 7.6.13 my entire site crashed and showed a critical error message.

I received the following message in my email:

An error of type E_ERROR has occurred on line 65 of the file
/home/USEREDITED/public_html/wp-content/plugins/wpdiscuz/class.WpdiscuzCore.php.

Error message: Uncaught Error: Class "wpDiscuzForm" not found in /home/USEREDITED/public_html/wp-content/plugins/wpdiscuz/class.WpdiscuzCore.php:65

Stack trace:
#0 /home/USEREDITED/public_html/wp-content/plugins/wpdiscuz/class.WpdiscuzCore.php(154): WpdiscuzCore->__construct()
#1 /home/USEREDITED/public_html/wp-content/plugins/wpdiscuz/utils/functions.php(8): WpdiscuzCore::getInstance()
#2 /home/USEREDITED/public_html/wp-content/plugins/wpdiscuz/class.WpdiscuzCore.php(2605): wpDiscuz()
#3 /home/USEREDITED/public_html/wp-settings.php(473): include_once('...')
#4 /home/USEREDITED/public_html/wp-config.php(93): require_once('...')
#5 /home/USEREDITED/public_html/wp-load.php(50): require_once('...')
#6 /home/USEREDITED/public_html/wp-admin/admin-ajax.php(22): require_once('...')
#7 {main}
  thrown

I deleted the folder plugin and everything was back to normal once again. My WordPress version is 6.4.1
My PHP version is 8.1