diff --git a/htdocs/compta/facture/card.php b/htdocs/compta/facture/card.php
index 2800fa7388d..762a0e11528 100644
--- a/htdocs/compta/facture/card.php
+++ b/htdocs/compta/facture/card.php
@@ -2029,6 +2029,8 @@ if (empty($reshook)) {
 		$price_ht_devise = '';
 		$price_ttc = '';
 		$price_ttc_devise = '';
+		$price_min = '';
+		$price_min_ttc = '';
 
 		if (GETPOST('price_ht') !== '') {
 			$price_ht = price2num(GETPOST('price_ht'), 'MU', 2);