From d975468e22aa93e69d9c0436abbfdbb9263b6332 Mon Sep 17 00:00:00 2001
From: klassm <klassm@2b470e98-0d58-463d-a4d8-8e2adae1ed80>
Date: Sun, 29 Jan 2012 10:38:52 +0000
Subject: [PATCH] bugfix for saving the previous state of CUL_FHTTK devices

git-svn-id: svn://svn.code.sf.net/p/fhem/code/trunk@1224 2b470e98-0d58-463d-a4d8-8e2adae1ed80
---
 fhem/FHEM/09_CUL_FHTTK.pm | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/fhem/FHEM/09_CUL_FHTTK.pm b/fhem/FHEM/09_CUL_FHTTK.pm
index 70cd398fc..3f11c31ce 100644
--- a/fhem/FHEM/09_CUL_FHTTK.pm
+++ b/fhem/FHEM/09_CUL_FHTTK.pm
@@ -194,10 +194,15 @@ CUL_FHTTK_Parse($$)
       }
   }
   
+  if (! defined($defs{$self}{READINGS}{"Previous"})) {
+    $defs{$self}{READINGS}{"Previous"}{VAL} = "";
+    $defs{$self}{READINGS}{"Previous"}{TIME} = "";
+  }
+  
   my $prevState = $defs{$self}{PREV}{STATE};
   if ($prevState != $state) {
     my ($windowReading,$windowState) = split(/:/, $fhttfk_codes{$prevState});
-    $defs{$self}{READINGS}{"Previous"}{VAL} = $windowState;
+    $defs{$self}{READINGS}{"Previous"}{VAL} = $windowState if $windowState ne "";
     $defs{$self}{READINGS}{"Previous"}{TIME} = TimeNow();
   }