Following error code is displayed on checkout page after adding products to cart via Add to Cart button of FBT plugin. I use the “Redirect To Checkout” feature.

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Warning: Undefined variable $enabled in /home/httpd/vhosts/onlinemarketingkurse.de/simply-great.com/wp-content/plugins/mighty-frequently-bought-together-pro/panel/template/mighty_fbt_get_data.php on line 38

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Thanks for any help.
Greetings from Luke