From c859055221b5c54a010ed1036837ddc1a22b3ca0 Mon Sep 17 00:00:00 2001
From: Thomas Gelf <thomas@gelf.net>
Date: Wed, 5 Oct 2016 17:20:25 +0000
Subject: [PATCH] CustomVariables: unset var if set to plain null

...but still allow for Null variables
---
 library/Director/CustomVariable/CustomVariables.php | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/library/Director/CustomVariable/CustomVariables.php b/library/Director/CustomVariable/CustomVariables.php
index f5de9b72..b080ebb9 100644
--- a/library/Director/CustomVariable/CustomVariables.php
+++ b/library/Director/CustomVariable/CustomVariables.php
@@ -77,6 +77,10 @@ class CustomVariables implements Iterator, Countable, IcingaConfigRenderer
         if ($value instanceof CustomVariable) {
             $value = clone($value);
         } else {
+            if ($value === null) {
+                $this->__unset($key);
+                return $this;
+            }
             $value = CustomVariable::create($key, $value);
         }