diff --git a/htdocs/contrat/fiche.php b/htdocs/contrat/fiche.php
index 27dfec3aed5..ac56afab3ca 100644
--- a/htdocs/contrat/fiche.php
+++ b/htdocs/contrat/fiche.php
@@ -306,7 +306,7 @@ else if ($action == 'addline' && $user->rights->contrat->creer)
         {
             $pu_ht=GETPOST('price_ht');
             $price_base_type = 'HT';
-            $tva_tx=str_replace('*','',GETPOST('tva_tx'));
+            $tva_tx=GETPOST('tva_tx')?str_replace('*','',GETPOST('tva_tx')):0;		// tva_tx field may be disabled, so we use vat rate 0 
             $tva_npr=preg_match('/\*/',GETPOST('tva_tx'))?1:0;
             $desc=GETPOST('dp_desc');
         }
@@ -424,7 +424,7 @@ else if ($action == 'updateligne' && $user->rights->contrat->creer && ! GETPOST(
         $objectline->subprice=GETPOST('elprice');
         $objectline->qty=GETPOST('elqty');
         $objectline->remise_percent=GETPOST('elremise_percent');
-        $objectline->tva_tx=GETPOST('eltva_tx');
+        $objectline->tva_tx=GETPOST('eltva_tx')?GETPOST('eltva_tx'):0;	// Field may be disabled, so we use vat rate 0
         $objectline->localtax1_tx=$localtax1_tx;
         $objectline->localtax2_tx=$localtax2_tx;
         $objectline->date_ouverture_prevue=$date_start_update;
diff --git a/htdocs/core/lib/admin.lib.php b/htdocs/core/lib/admin.lib.php
index 0aa88aeeafa..cf817ae494d 100644
--- a/htdocs/core/lib/admin.lib.php
+++ b/htdocs/core/lib/admin.lib.php
@@ -1147,19 +1147,21 @@ function showModulesExludedForExternal($modules)
 	$text=$langs->trans("OnlyFollowingModulesAreOpenedToExternalUsers");
 	$listofmodules=explode(',',$conf->global->MAIN_MODULES_FOR_EXTERNAL);
 	$i=0;
-	foreach($modules as $module)
-	{
-		$moduleconst=$module->const_name;
-		$modulename=strtolower($module->name);
-		//print 'modulename='.$modulename;
-
-		//if (empty($conf->global->$moduleconst)) continue;
-		if (! in_array($modulename,$listofmodules)) continue;
-
-		if ($i > 0) $text.=', ';
-		else $text.=' ';
-		$i++;
-		$text .= $langs->trans('Module'.$module->numero.'Name');
+	if (!empty($modules)) {
+		foreach($modules as $module)
+		{
+			$moduleconst=$module->const_name;
+			$modulename=strtolower($module->name);
+			//print 'modulename='.$modulename;
+	
+			//if (empty($conf->global->$moduleconst)) continue;
+			if (! in_array($modulename,$listofmodules)) continue;
+	
+			if ($i > 0) $text.=', ';
+			else $text.=' ';
+			$i++;
+			$text .= $langs->trans('Module'.$module->numero.'Name');
+		}
 	}
 	return img_picto($langs->trans('InfoAdmin'), 'star').' '.$text;
 }
diff --git a/htdocs/langs/en_US/main.lang b/htdocs/langs/en_US/main.lang
index 0bc8e8d9451..f510a561655 100644
--- a/htdocs/langs/en_US/main.lang
+++ b/htdocs/langs/en_US/main.lang
@@ -282,6 +282,8 @@ AmountTTCShort=Amount (inc. tax)
 AmountHT=Amount (net of tax)
 AmountTTC=Amount (inc. tax)
 AmountVAT=Amount tax
+AmountLT1=Amount tax 2
+AmountLT2=Amount tax 3
 AmountLT1ES=Amount RE
 AmountLT2ES=Amount IRPF
 AmountTotal=Total amount
diff --git a/htdocs/langs/fr_FR/main.lang b/htdocs/langs/fr_FR/main.lang
index ddac2178b58..e01cb97537e 100644
--- a/htdocs/langs/fr_FR/main.lang
+++ b/htdocs/langs/fr_FR/main.lang
@@ -284,6 +284,8 @@ AmountTTCShort=Montant TTC
 AmountHT=Montant HT
 AmountTTC=Montant TTC
 AmountVAT=Montant TVA
+AmountLT1=Montant Tax 2
+AmountLT2=Montant Tax 3
 AmountLT1ES=Montant RE
 AmountLT2ES=Montant IRPF
 AmountTotal=Montant total