diff --git a/htdocs/compta/facture/card-rec.php b/htdocs/compta/facture/card-rec.php
index 5f90769688b..1e7ae045cae 100644
--- a/htdocs/compta/facture/card-rec.php
+++ b/htdocs/compta/facture/card-rec.php
@@ -437,6 +437,9 @@ if (empty($reshook)) {
 
 		$qty = price2num(GETPOST('qty'.$predef, 'alpha'), 'MS', 2);
 		$remise_percent = price2num(GETPOST('remise_percent'.$predef), '', 2);
+		if (empty($remise_percent)) {
+			$remise_percent = 0;
+		}
 
 		// Extrafields
 		$extralabelsline = $extrafields->fetch_name_optionals_label($object->table_element_line);
@@ -637,7 +640,7 @@ if (empty($reshook)) {
 				$info_bits |= 0x01;
 			}
 
-			if ($usercanproductignorepricemin && (!empty($price_min) && (price2num($pu_ht) * (1 - price2num((float) $remise_percent) / 100) < price2num($price_min)))) {
+			if ($usercanproductignorepricemin && (!empty($price_min) && (price2num($pu_ht) * (1 - price2num($remise_percent) / 100) < price2num($price_min)))) {
 				$mesg = $langs->trans("CantBeLessThanMinPrice", price(price2num($price_min, 'MU'), 0, $langs, 0, 0, - 1, $conf->currency));
 				setEventMessages($mesg, null, 'errors');
 			} else {
@@ -784,6 +787,9 @@ if (empty($reshook)) {
 		}*/
 
 		$remise_percent = price2num(GETPOST('remise_percent'), '', 2);
+		if (empty($remise_percent)) {
+			$remise_percent = 0;
+		}
 
 		// Check minimum price
 		$productid = GETPOST('productid', 'int');
@@ -803,7 +809,7 @@ if (empty($reshook)) {
 			$typeinvoice = Facture::TYPE_STANDARD;
 
 			// Check price is not lower than minimum (check is done only for standard or replacement invoices)
-			if (((!empty($conf->global->MAIN_USE_ADVANCED_PERMS) && empty($user->rights->produit->ignore_price_min_advance)) || empty($conf->global->MAIN_USE_ADVANCED_PERMS)) && (($typeinvoice == Facture::TYPE_STANDARD || $typeinvoice == Facture::TYPE_REPLACEMENT) && $price_min && ((float) price2num($pu_ht) * (1 - (float) $remise_percent / 100) < (float) price2num($price_min)))) {
+			if (((!empty($conf->global->MAIN_USE_ADVANCED_PERMS) && empty($user->rights->produit->ignore_price_min_advance)) || empty($conf->global->MAIN_USE_ADVANCED_PERMS)) && (($typeinvoice == Facture::TYPE_STANDARD || $typeinvoice == Facture::TYPE_REPLACEMENT) && $price_min && (price2num($pu_ht) * (1 - $remise_percent / 100) < price2num($price_min)))) {
 				setEventMessages($langs->trans("CantBeLessThanMinPrice", price(price2num($price_min, 'MU'), 0, $langs, 0, 0, - 1, $conf->currency)), null, 'errors');
 				$error++;
 			}