diff --git a/htdocs/core/lib/files.lib.php b/htdocs/core/lib/files.lib.php
index ae4afc695e6..ef954794964 100644
--- a/htdocs/core/lib/files.lib.php
+++ b/htdocs/core/lib/files.lib.php
@@ -2422,7 +2422,7 @@ function dol_compress_dir($inputdir, $outputfile, $mode = "zip", $excludefiles =
 function dol_most_recent_file($dir, $regexfilter = '', $excludefilter = array('(\.meta|_preview.*\.png)$', '^\.'), $nohook = false, $mode = '')
 {
 	$tmparray = dol_dir_list($dir, 'files', 0, $regexfilter, $excludefilter, 'date', SORT_DESC, $mode, $nohook);
-	return $tmparray[0];
+	return isset($tmparray[0])?$tmparray[0]:null;
 }
 
 /**
diff --git a/htdocs/core/modules/mailings/contacts1.modules.php b/htdocs/core/modules/mailings/contacts1.modules.php
index 7406779054b..be77cf155d2 100644
--- a/htdocs/core/modules/mailings/contacts1.modules.php
+++ b/htdocs/core/modules/mailings/contacts1.modules.php
@@ -122,7 +122,7 @@ class mailing_contacts1 extends MailingTargets
 	 */
 	public function formFilter()
 	{
-		global $langs;
+		global $langs,$conf;
 
 		// Load translation files required by the page
 		$langs->loadLangs(array("commercial", "companies", "suppliers", "categories"));
@@ -308,11 +308,12 @@ class mailing_contacts1 extends MailingTargets
 		$s .= ajax_combobox("filter_category_supplier_contact");
 
 		// Choose language
-		require_once DOL_DOCUMENT_ROOT.'/core/class/html.formadmin.class.php';
-		$formadmin = new FormAdmin($this->db);
-		$s .= '<span class="opacitymedium">'.$langs->trans("DefaultLang").':</span> ';
-		$s .= $formadmin->select_language($langs->getDefaultLang(1), 'filter_lang', 0, 0, 1, 0, 0, '', 0, 0, 0, null, 1);
-
+		if (getDolGlobalInt('MAIN_MULTILANGS')) {
+			require_once DOL_DOCUMENT_ROOT.'/core/class/html.formadmin.class.php';
+			$formadmin = new FormAdmin($this->db);
+			$s .= '<span class="opacitymedium">'.$langs->trans("DefaultLang").':</span> ';
+			$s .= $formadmin->select_language($langs->getDefaultLang(1), 'filter_lang', 0, 0, 1, 0, 0, '', 0, 0, 0, null, 1);
+		}
 		return $s;
 	}