diff --git a/fhem/CHANGED b/fhem/CHANGED
index 71b4a5fbc..f29131108 100644
--- a/fhem/CHANGED
+++ b/fhem/CHANGED
@@ -1,5 +1,6 @@
 # Add changes at the top of the list. Keep it in ASCII, and 80-char wide.
 # Do not insert empty lines here, update check depends on it.
+ - bugfix:  48_MieleAtHome: fix warning
  - feature: configDB.pm: show version counter in "configDB saved. (xx)"
  - feature: 93_DbLog: possible use of alternative tables for SVG Plots 
                       Forum:134547, fix warnings
diff --git a/fhem/FHEM/48_MieleAtHome.pm b/fhem/FHEM/48_MieleAtHome.pm
index 222368d26..109f00c27 100644
--- a/fhem/FHEM/48_MieleAtHome.pm
+++ b/fhem/FHEM/48_MieleAtHome.pm
@@ -35,7 +35,7 @@ use Encode qw(encode_utf8);
 use List::Util qw[min max];
 use JSON;
 
-my $version = "2.1.0";
+my $version = "2.1.1";
 
 my $MAH_hasMimeBase64 = 1;
 
@@ -1645,7 +1645,8 @@ sub MAH_calculateETA($$$)
 sub MAH_formatTime(@)
 {
 	my ($hour, $minute) = @_;
-	return sprintf("%d:%02d", $hour, $minute);
+	return sprintf("%d:%02d", defined($hour)   ? $hour   : 0,
+	                          defined($minute) ? $minute : 0);
 }
 
 #------------------------------------------------------------------------------------------------------