diff --git a/htdocs/comm/propal/card.php b/htdocs/comm/propal/card.php
index f2c549f91f7..e14a2c05246 100644
--- a/htdocs/comm/propal/card.php
+++ b/htdocs/comm/propal/card.php
@@ -1363,6 +1363,9 @@ if (empty($reshook)) {
 		$date_end = dol_mktime(GETPOST('date_endhour'), GETPOST('date_endmin'), GETPOST('date_endsec'), GETPOST('date_endmonth'), GETPOST('date_endday'), GETPOST('date_endyear'));
 
 		$remise_percent = price2num(GETPOST('remise_percent'), '', 2);
+		if (empty($remise_percent)) {
+			$remise_percent = 0;
+		}
 
 		// Prepare a price equivalent for minimum price check
 		$pu_equivalent = $pu_ht;