diff --git a/htdocs/supplier_proposal/card.php b/htdocs/supplier_proposal/card.php
index 3f7b1eeb71c..5756149e74d 100644
--- a/htdocs/supplier_proposal/card.php
+++ b/htdocs/supplier_proposal/card.php
@@ -448,10 +448,10 @@ if (empty($reshook)) {
 						if (empty($conf->global->MAIN_DISABLE_PDF_AUTOUPDATE)) {
 							$outputlangs = $langs;
 							$newlang = '';
-							if ($conf->global->MAIN_MULTILANGS && empty($newlang) && GETPOST('lang_id', 'aZ09')) {
+							if (!empty($conf->global->MAIN_MULTILANGS) && empty($newlang) && GETPOST('lang_id', 'aZ09')) {
 								$newlang = GETPOST('lang_id', 'aZ09');
 							}
-							if ($conf->global->MAIN_MULTILANGS && empty($newlang)) {
+							if (!empty($conf->global->MAIN_MULTILANGS) && empty($newlang)) {
 								$newlang = $object->thirdparty->default_lang;
 							}
 							if (!empty($newlang)) {