From 7f8d825f604c0a47128869bd185ea6918a1f70ce Mon Sep 17 00:00:00 2001
From: Dennis Eichhorn <spl1nnes.com@googlemail.com>
Date: Mon, 23 Oct 2023 01:43:19 +0000
Subject: [PATCH] fix null type

---
 Mpdf/Otl.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Mpdf/Otl.php b/Mpdf/Otl.php
index 6cf7b7a..21526a9 100755
--- a/Mpdf/Otl.php
+++ b/Mpdf/Otl.php
@@ -6135,7 +6135,7 @@ class Otl
 		if ($available == '') {
 			return '';
 		}
-		$tags = preg_split('/-/', $ietf);
+		$tags = preg_split('/-/', $ietf ?? '');
 		$lang = '';
 		$country = '';
 		$script = '';