From 8b650e57d6bbbf294e844d3a6f226a9bb0d342e2 Mon Sep 17 00:00:00 2001
From: jim-p <jimp@pfsense.org>
Date: Thu, 20 Mar 2014 12:08:37 -0400
Subject: [PATCH] Avoid placing an empty "interface listen" directive in
 ntpd.conf

---
 etc/inc/system.inc | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/etc/inc/system.inc b/etc/inc/system.inc
index 37f7d3432d..59ffd94bde 100644
--- a/etc/inc/system.inc
+++ b/etc/inc/system.inc
@@ -1631,7 +1631,8 @@ function system_ntp_configure($start_ntpd=true) {
 			if (!is_ipaddr($interface)) {
 				$interface = get_real_interface($interface);
 			}
-			$ntpcfg .= "interface listen {$interface}\n";
+			if (!empty($interface))
+				$ntpcfg .= "interface listen {$interface}\n";
 		}
 	}