diff --git a/htdocs/compta/facture.php b/htdocs/compta/facture.php
index 32505622a85..d5e24eb61f8 100644
--- a/htdocs/compta/facture.php
+++ b/htdocs/compta/facture.php
@@ -29,13 +29,13 @@
  */
 
 require '../main.inc.php';
-require DOL_DOCUMENT_ROOT . '/compta/facture/class/facture.class.php';
-require DOL_DOCUMENT_ROOT . '/compta/paiement/class/paiement.class.php';
-require DOL_DOCUMENT_ROOT . '/core/modules/facture/modules_facture.php';
-require DOL_DOCUMENT_ROOT . '/core/class/discount.class.php';
-require DOL_DOCUMENT_ROOT . '/core/class/html.formfile.class.php';
-require DOL_DOCUMENT_ROOT . '/core/class/html.formother.class.php';
-require DOL_DOCUMENT_ROOT . '/core/lib/invoice.lib.php';
+require_once DOL_DOCUMENT_ROOT . '/compta/facture/class/facture.class.php';
+require_once DOL_DOCUMENT_ROOT . '/compta/paiement/class/paiement.class.php';
+require_once DOL_DOCUMENT_ROOT . '/core/modules/facture/modules_facture.php';
+require_once DOL_DOCUMENT_ROOT . '/core/class/discount.class.php';
+require_once DOL_DOCUMENT_ROOT . '/core/class/html.formfile.class.php';
+require_once DOL_DOCUMENT_ROOT . '/core/class/html.formother.class.php';
+require_once DOL_DOCUMENT_ROOT . '/core/lib/invoice.lib.php';
 require_once DOL_DOCUMENT_ROOT . '/core/lib/functions2.lib.php';
 require_once DOL_DOCUMENT_ROOT . '/core/lib/date.lib.php';
 
diff --git a/htdocs/compta/facture/class/facture.class.php b/htdocs/compta/facture/class/facture.class.php
index 2333802cc40..578049503c4 100644
--- a/htdocs/compta/facture/class/facture.class.php
+++ b/htdocs/compta/facture/class/facture.class.php
@@ -3457,7 +3457,7 @@ class FactureLigne
         	$sql.= ",total_localtax1=".price2num($this->total_localtax1)."";
         	$sql.= ",total_localtax2=".price2num($this->total_localtax2)."";
         }
-		$sql.= " , fk_product_fournisseur_price='".$this->fk_fournprice."'";
+		$sql.= " , fk_product_fournisseur_price=".(! empty($this->fk_fournprice)?"'".$this->db->escape($this->fk_fournprice)."'":"null");
 		$sql.= " , buy_price_ht='".price2num($this->pa_ht)."'";
         $sql.= ",fk_parent_line=".($this->fk_parent_line>0?$this->fk_parent_line:"null");
         if (! empty($this->rang)) $sql.= ", rang=".$this->rang;