fichier : /src/Adapter/Product/AdminProductDataProvider.php
ligne 391
remplacer
$product['price_final'] = $localeCldr->formatPrice($product['price_final'], $currency->iso_code);
par
if(!empty($product['price_final'])){
$product['price_final'] = $localeCldr->formatPrice($product['price_final'], $currency->iso_code);
}