diff --git a/htdocs/fourn/class/fournisseur.facture.class.php b/htdocs/fourn/class/fournisseur.facture.class.php
index 39b9d97dde2..ca7c95cd464 100644
--- a/htdocs/fourn/class/fournisseur.facture.class.php
+++ b/htdocs/fourn/class/fournisseur.facture.class.php
@@ -3410,7 +3410,7 @@ class SupplierInvoiceLine extends CommonObjectLine
 		$sql .= ", pu_ttc = ".price2num($this->pu_ttc);
 		$sql .= ", qty = ".price2num($this->qty);
 		$sql .= ", remise_percent = ".price2num($this->remise_percent);
-		if ($this->fk_remise_except) $sql .= ", fk_remise_except=".((int) $this->fk_remise_except);
+		if ($this->fk_remise_except > 0) $sql .= ", fk_remise_except=".((int) $this->fk_remise_except);
 		else $sql .= ", fk_remise_except=null";
 		$sql .= ", vat_src_code = '".$this->db->escape(empty($this->vat_src_code) ? '' : $this->vat_src_code)."'";
 		$sql .= ", tva_tx = ".price2num($this->tva_tx);
@@ -3423,7 +3423,7 @@ class SupplierInvoiceLine extends CommonObjectLine
 		$sql .= ", total_localtax1= ".price2num($this->total_localtax1);
 		$sql .= ", total_localtax2= ".price2num($this->total_localtax2);
 		$sql .= ", total_ttc = ".price2num($this->total_ttc);
-		$sql .= ", fk_product = ".((int) $fk_product);
+		$sql .= ", fk_product = ".($fk_product > 0 ? (int) $fk_product : 'null');
 		$sql .= ", product_type = ".((int) $this->product_type);
 		$sql .= ", info_bits = ".((int) $this->info_bits);
 		$sql .= ", fk_unit = ".($fk_unit > 0 ? (int) $fk_unit : 'null');