From 54af1c434d274d00743fff0564e2e2f0fea7069d Mon Sep 17 00:00:00 2001
From: Ad Schellevis <ad@opnsense.org>
Date: Tue, 11 Dec 2018 21:34:11 +0100
Subject: [PATCH] Firewall/alias, when traversing config, make sure the item
 exists, for https://github.com/opnsense/core/issues/3037

---
 src/opnsense/mvc/app/models/OPNsense/Firewall/Alias.php | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/opnsense/mvc/app/models/OPNsense/Firewall/Alias.php b/src/opnsense/mvc/app/models/OPNsense/Firewall/Alias.php
index 282e558eb..efc88cc08 100644
--- a/src/opnsense/mvc/app/models/OPNsense/Firewall/Alias.php
+++ b/src/opnsense/mvc/app/models/OPNsense/Firewall/Alias.php
@@ -80,7 +80,9 @@ class Alias extends BaseModel
         foreach ($this->getAliasSource() as $aliasref) {
             $cfgsection = $cfgObj;
             foreach ($aliasref[0] as $cfgName) {
-                $cfgsection = $cfgsection->$cfgName;
+                if ($cfgsection != null) {
+                    $cfgsection = $cfgsection->$cfgName;
+                }
             }
             if ($cfgsection != null) {
                 $nodeidx = 0;