diff --git a/htdocs/core/lib/price.lib.php b/htdocs/core/lib/price.lib.php
index eb332b44611..fe2c1d73809 100644
--- a/htdocs/core/lib/price.lib.php
+++ b/htdocs/core/lib/price.lib.php
@@ -89,6 +89,7 @@ function calcul_price_total($qty, $pu, $remise_percent_ligne, $txtva, $uselocalt
 	$result=array();
 
 	// Clean parameters
+	if (empty($pu)) $pu=0;
 	if (empty($info_bits)) $info_bits=0;
 	if (empty($txtva)) $txtva=0;
 	if (empty($seller) || ! is_object($seller))