From 2f4514a3b243ea450d42de7ddbd940d64a2593e3 Mon Sep 17 00:00:00 2001
From: Andreas Rupper <61623186+andreas-rupper@users.noreply.github.com>
Date: Thu, 2 Jul 2020 06:53:36 +0200
Subject: [PATCH] dns/dyndns: added not empty validation (#1903)

---
 dns/dyndns/src/www/services_dyndns_edit.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/dns/dyndns/src/www/services_dyndns_edit.php b/dns/dyndns/src/www/services_dyndns_edit.php
index bf3d92e87..d13e55212 100644
--- a/dns/dyndns/src/www/services_dyndns_edit.php
+++ b/dns/dyndns/src/www/services_dyndns_edit.php
@@ -139,7 +139,7 @@ if ($_SERVER['REQUEST_METHOD'] === 'GET') {
         $input_errors[] = gettext("The username contains invalid characters.");
     }
 
-    if ((string)((int)$pconfig['ttl']) != $pconfig['ttl']) {
+    if (!empty($pconfig['ttl']) && (string)((int)$pconfig['ttl']) != $pconfig['ttl']) {
         $input_errors[] = gettext("The TTL value needs to be a valid integer number.");
     }