From ce9f94fedaeac061ffcf56421029016ef6ed8aaf Mon Sep 17 00:00:00 2001
From: Nathaniel Donahue <nathaniel.donahue@netways.de>
Date: Wed, 28 Oct 2020 08:27:56 +0100
Subject: [PATCH] GetHostByAddr: Handle Null

---
 .../PropertyModifier/PropertyModifierGetHostByAddr.php       | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/library/Director/PropertyModifier/PropertyModifierGetHostByAddr.php b/library/Director/PropertyModifier/PropertyModifierGetHostByAddr.php
index 11adb4f4..eda66d1a 100644
--- a/library/Director/PropertyModifier/PropertyModifierGetHostByAddr.php
+++ b/library/Director/PropertyModifier/PropertyModifierGetHostByAddr.php
@@ -29,7 +29,10 @@ class PropertyModifierGetHostByAddr extends PropertyModifierHook
 
     public function transform($value)
     {
-        $host = gethostbyaddr($value);
+	if ($value === null) {
+	     return null;
+	}
+	$host = gethostbyaddr($value);
         if ($host === false) {
             switch ($this->getSetting('on_failure')) {
                 case 'null':