diff --git a/htdocs/core/lib/price.lib.php b/htdocs/core/lib/price.lib.php
index be392fcad9125..03eb651e4db66 100644
--- a/htdocs/core/lib/price.lib.php
+++ b/htdocs/core/lib/price.lib.php
@@ -93,10 +93,14 @@ function calcul_price_total($qty, $pu, $remise_percent_ligne, $txtva, $uselocalt
 	//dol_syslog("Price.lib::calcul_price_total qty=".$qty." pu=".$pu." remiserpercent_ligne=".$remise_percent_ligne." txtva=".$txtva." uselocaltax1_rate=".$uselocaltax1_rate." uselocaltax2_rate=".$uselocaltax2_rate.' remise_percent_global='.$remise_percent_global.' price_base_type='.$ice_base_type.' type='.$type.' progress='.$progress);
 
 	$countryid=$seller->country_id;
+	
+	if (is_numeric($uselocaltax1_rate)) $uselocaltax1_rate=(float) $uselocaltax1_rate;
+	if (is_numeric($uselocaltax2_rate)) $uselocaltax2_rate=(float) $uselocaltax2_rate;
+	
 	if ($uselocaltax1_rate < 0) $uselocaltax1_rate=$seller->localtax1_assuj;
 	if ($uselocaltax2_rate < 0) $uselocaltax2_rate=$seller->localtax2_assuj;
 
-	dol_syslog('Price.lib::calcul_price_total qty='.$qty.' pu='.$pu.' remise_percent_ligne='.$remise_percent_ligne.' txtva='.$txtva.' uselocaltax1_rate='.$uselocaltax1_rate.' uselocaltax2_rate='.$uselocaltax2_rate.' remise_percent_global='.$remise_percent_global.' price_base_type='.$ice_base_type.' type='.$type.' progress='.$progress);
+	dol_syslog('Price.lib::calcul_price_total qty='.$qty.' pu='.$pu.' remise_percent_ligne='.$remise_percent_ligne.' txtva='.$txtva.' uselocaltax1_rate='.$uselocaltax1_rate.' uselocaltax2_rate='.$uselocaltax2_rate.' remise_percent_global='.$remise_percent_global.' price_base_type='.$price_base_type.' type='.$type.' progress='.$progress);
 
     // Now we search localtaxes information ourself (rates and types).
 	$localtax1_type=0;
@@ -170,7 +174,7 @@ function calcul_price_total($qty, $pu, $remise_percent_ligne, $txtva, $uselocalt
         if ($type == 1) $apply_tax = true;
         break;
     }
-    if ($uselocaltax1_rate!=0 && $apply_tax) {
+    if ($uselocaltax1_rate && $apply_tax) {
   		$result[14] = price2num(($tot_sans_remise_wt * (1 + ( $localtax1_rate / 100))) - $tot_sans_remise_wt, 'MT');
   		$localtaxes[0] += $result[14];
 
@@ -193,7 +197,7 @@ function calcul_price_total($qty, $pu, $remise_percent_ligne, $txtva, $uselocalt
         if ($type == 1) $apply_tax = true;
         break;
     }
-    if ($uselocaltax2_rate!=0 && $apply_tax) {
+    if ($uselocaltax2_rate && $apply_tax) {
   		$result[15] = price2num(($tot_sans_remise_wt * (1 + ( $localtax2_rate / 100))) - $tot_sans_remise_wt, 'MT');
   		$localtaxes[0] += $result[15];
 
@@ -264,7 +268,7 @@ function calcul_price_total($qty, $pu, $remise_percent_ligne, $txtva, $uselocalt
         if ($type == 1) $apply_tax = true;
         break;
     }
-    if ($uselocaltax1_rate!=0 && $apply_tax) {
+    if ($uselocaltax1_rate && $apply_tax) {
   		$result[14] = price2num(($tot_sans_remise * (1 + ( $localtax1_rate / 100))) - $tot_sans_remise, 'MT');	// amount tax1 for total_ht_without_discount
   		$result[8] += $result[14];																				// total_ttc_without_discount + tax1
 
@@ -287,7 +291,7 @@ function calcul_price_total($qty, $pu, $remise_percent_ligne, $txtva, $uselocalt
         if ($type == 1) $apply_tax = true;
         break;
     }
-    if ($uselocaltax2_rate!=0 && $apply_tax) {
+    if ($uselocaltax2_rate && $apply_tax) {
   		$result[15] = price2num(($tot_sans_remise * (1 + ( $localtax2_rate / 100))) - $tot_sans_remise, 'MT');	// amount tax2 for total_ht_without_discount
   		$result[8] += $result[15];																				// total_ttc_without_discount + tax2