Uncaught TypeError: Unsupported operand types

Page blanche et erreur dans les logs apache lorsqu'on clic sur l'onglet promo d'un produit. Sous dlb 16 et php 8.

PHP Fatal error: Uncaught TypeError: Unsupported operand types: string * string in /var/www/html/doli16/htdocs/custom/discountprice/product_tab.php:99\nStack trace:\n#0 {main}\n thrown in /var/www/html/doli16/htdocs/custom/discountprice/product_tab.php on line 99, referer: http://10.43.47.218/doli16/htdocs/product/card.php?id=2

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