From 5ddf12b29c0eab546d9f53972a977feebce08558 Mon Sep 17 00:00:00 2001
From: Laurent Destailleur <eldy@destailleur.fr>
Date: Tue, 15 Jun 2021 22:06:26 +0200
Subject: [PATCH] Fix set language

---
 htdocs/core/actions_massactions.inc.php | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/htdocs/core/actions_massactions.inc.php b/htdocs/core/actions_massactions.inc.php
index 3cbcd30af7f..60b386ce083 100644
--- a/htdocs/core/actions_massactions.inc.php
+++ b/htdocs/core/actions_massactions.inc.php
@@ -956,8 +956,11 @@ if (!$error && $massaction == "builddoc" && $permissiontoread && !GETPOST('butto
 	// Define output language (Here it is not used because we do only merging existing PDF)
 	$outputlangs = $langs;
 	$newlang = '';
-	if ($conf->global->MAIN_MULTILANGS && empty($newlang) && GETPOST('lang_id', 'aZ09')) $newlang = GETPOST('lang_id', 'aZ09');
-	if ($conf->global->MAIN_MULTILANGS && empty($newlang)) $newlang = $objecttmp->thirdparty->default_lang;
+	if ($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 = $objecttmp->thirdparty->default_lang;
+	}
 	if (!empty($newlang)) {
 		$outputlangs = new Translate("", $conf);
 		$outputlangs->setDefaultLang($newlang);