From dec08529be5638096f29074185c1f916049213dc Mon Sep 17 00:00:00 2001
From: hobbyquaker <bastiraff@googlemail.com>
Date: Fri, 8 Nov 2019 20:16:09 +0100
Subject: [PATCH] handle numeric zero topic replacements (#100)

---
 nodes/ccu-connection.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/nodes/ccu-connection.js b/nodes/ccu-connection.js
index f19a83e..8968dce 100644
--- a/nodes/ccu-connection.js
+++ b/nodes/ccu-connection.js
@@ -2345,7 +2345,7 @@ module.exports = function (RED) {
                         rkey = 'iface';
                     }
 
-                    topic = topic.replace(rx, msgLower[rkey] || '');
+                    topic = topic.replace(rx, typeof msgLower[rkey] === 'undefined' ? '' : msgLower[rkey]);
                 });
             }