diff --git a/htdocs/core/actions_massactions.inc.php b/htdocs/core/actions_massactions.inc.php
index 60b386ce083..1ee8dc4b0f2 100644
--- a/htdocs/core/actions_massactions.inc.php
+++ b/htdocs/core/actions_massactions.inc.php
@@ -958,9 +958,10 @@ if (!$error && $massaction == "builddoc" && $permissiontoread && !GETPOST('butto
 	$newlang = '';
 	if ($conf->global->MAIN_MULTILANGS && empty($newlang) && GETPOST('lang_id', 'aZ09')) {
 		$newlang = GETPOST('lang_id', 'aZ09');
-	} elseif ($conf->global->MAIN_MULTILANGS && empty($newlang) && is_object($objecttmp->thirdparty)) {
-		$newlang = $objecttmp->thirdparty->default_lang;
 	}
+	//elseif ($conf->global->MAIN_MULTILANGS && empty($newlang) && is_object($objecttmp->thirdparty)) {		// On massaction, we can have several values for $objecttmp->thirdparty
+	//	$newlang = $objecttmp->thirdparty->default_lang;
+	//}
 	if (!empty($newlang)) {
 		$outputlangs = new Translate("", $conf);
 		$outputlangs->setDefaultLang($newlang);