diff --git a/htdocs/contrat/class/contrat.class.php b/htdocs/contrat/class/contrat.class.php
index 5a882a4e68e..f8ffa809a86 100644
--- a/htdocs/contrat/class/contrat.class.php
+++ b/htdocs/contrat/class/contrat.class.php
@@ -1703,8 +1703,8 @@ class Contrat extends CommonObject
 		$total_localtax1 = $tabprice[9];
 		$total_localtax2 = $tabprice[10];
 
-		$localtax1_type = $localtaxes_type[0];
-		$localtax2_type = $localtaxes_type[2];
+		$localtax1_type = (empty($localtaxes_type[0]) ? '' : $localtaxes_type[0]);
+		$localtax2_type = (empty($localtaxes_type[2]) ? '' : $localtaxes_type[2]);
 
 		// TODO A virer
 		// Anciens indicateurs: $price, $remise (a ne plus utiliser)
@@ -1737,8 +1737,8 @@ class Contrat extends CommonObject
 		$sql .= ",tva_tx = ".((float) price2num($tvatx));
 		$sql .= ",localtax1_tx = ".((float) price2num($localtax1tx));
 		$sql .= ",localtax2_tx = ".((float) price2num($localtax2tx));
-		$sql .= ",localtax1_type='".$this->db->escape($localtax1_type);
-		$sql .= ",localtax2_type='".$this->db->escape($localtax2_type);
+		$sql .= ",localtax1_type='".$this->db->escape($localtax1_type)."'";
+		$sql .= ",localtax2_type='".$this->db->escape($localtax2_type)."'";
 		$sql .= ", total_ht = ".((float) price2num($total_ht));
 		$sql .= ", total_tva = ".((float) price2num($total_tva));
 		$sql .= ", total_localtax1 = ".((float) price2num($total_localtax1));