Fatal Error – No Longer Working

Downloaded plugin with high hopes that my clients with EPX accounts could avoid the $20 per month authorize.net fee and support payment gateway directly with WooCommerce. It worked for awhile and then yesterday the payment section said “Critical error on website” and when I went to the payment settings of WooCommerce the EPX option was gone with the following message: Fatal error: Uncaught TypeError: Argument 1 passed to Automattic\WooCommerce\Internal\Utilities\HtmlSanitizer::sanitize() must be of the type string, null given…….. Also: There has been a critical error on this website. Please check your site admin email inbox for instructions. Needless to say I have to uninstall and use authorize.net to bridge the gap between EPX and WooCommerce.