From a1b611b8d8b1d70d24e432a50321ae7aaea4a9df Mon Sep 17 00:00:00 2001
From: rudolfkoenig <rudolfkoenig@2b470e98-0d58-463d-a4d8-8e2adae1ed80>
Date: Mon, 24 Apr 2017 11:45:05 +0000
Subject: [PATCH] fhem.pl: Avoid warning and help localize bad userReadings
 definition (Forum #70999)

git-svn-id: https://svn.fhem.de/fhem/trunk@14096 2b470e98-0d58-463d-a4d8-8e2adae1ed80
---
 fhem/fhem.pl | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fhem/fhem.pl b/fhem/fhem.pl
index a1934773e..b6b4c5b17 100755
--- a/fhem/fhem.pl
+++ b/fhem/fhem.pl
@@ -4226,6 +4226,9 @@ readingsEndUpdate($$)
         $value = "Error evaluating $name userReading $reading: $@";
         Log 1, $value;
         $result= $value;
+      } elsif(!defined($value)) {
+        warn("$name userReadings $reading evaluated to undef");
+        next;
       } elsif($modifier eq "none") {
         $result= $value;
       } elsif($modifier eq "difference") {