From e5bc6130cb2584ee467c7e6ab25c800045dd3a9b Mon Sep 17 00:00:00 2001
From: rudolfkoenig <rudolfkoenig@2b470e98-0d58-463d-a4d8-8e2adae1ed80>
Date: Mon, 5 May 2014 15:41:00 +0000
Subject: [PATCH] FileLog: fix delta-h/delta-d Problem (forum #23100)

git-svn-id: svn://svn.code.sf.net/p/fhem/code/trunk@5752 2b470e98-0d58-463d-a4d8-8e2adae1ed80
---
 fhem/FHEM/92_FileLog.pm | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fhem/FHEM/92_FileLog.pm b/fhem/FHEM/92_FileLog.pm
index dcabd6e19..4e14d4995 100755
--- a/fhem/FHEM/92_FileLog.pm
+++ b/fhem/FHEM/92_FileLog.pm
@@ -759,7 +759,8 @@ RESCAN:
       my @lda = split("[_:]", $lastdate{$hd});
       my $ts = "12:00:00";                   # middle timestamp
       $ts = "$lda[1]:30:00" if($hd == 13);
-      my $line = sprintf("%s_%s %0.1f\n", $lda[0],$ts, $h->{last2}-$h->{last1});
+      my $line = sprintf("%s_%s %0.1f\n", $lda[0],$ts,
+                defined($h->{last1}) ? $h->{last2}-$h->{last1} : 0);
 
       if($outf eq "-") {
         $h->{ret} .= $line;