Add check for local port being set before testing. Fixes #2606

1 files changed, 1 insertions, 1 deletions

diff --git a/usr/local/www/firewall_nat_edit.php b/usr/local/www/firewall_nat_edit.php
index b50967b..1ac2270 100755
--- a/usr/local/www/firewall_nat_edit.php
+++ b/usr/local/www/firewall_nat_edit.php
@@ -229,7 +229,7 @@ if ($_POST) {
 	if ($_POST['dstendport'] && !is_portoralias($_POST['dstendport']))
 		$input_errors[] = sprintf(gettext("%s is not a valid end destination port. It must be a port alias or integer between 1 and 65535."), $_POST['dstendport']);
 
-	if (!isset($_POST['nordr']) && !is_portoralias($_POST['localbeginport'])) {
+	if (!isset($_POST['nordr']) && $_POST['localbeginport'] && !is_portoralias($_POST['localbeginport'])) {
 		$input_errors[] = sprintf(gettext("A valid local port must be specified. It must be a port alias or integer between 1 and 65535."), $_POST['localbeginport']);
 	}