diff --git a/CHANGED b/CHANGED
index 933c538dd..849accab9 100644
--- a/CHANGED
+++ b/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:  74_AMAD: fix Issues 475717
   - feature: 77_UWZ: added lang attribute
   - feature: 98_rssFeed: optionally create events for all readings
   - bugfix:  77_UWZ: fix Issues 472183 and 473982
diff --git a/FHEM/74_AMAD.pm b/FHEM/74_AMAD.pm
index 14f2118e3..37d1fb4c8 100644
--- a/FHEM/74_AMAD.pm
+++ b/FHEM/74_AMAD.pm
@@ -37,8 +37,8 @@ use TcpServerUtils;
 use Encode qw(encode);
 
 
-my $modulversion = "2.4.1";
-my $flowsetversion = "2.4.0";
+my $modulversion = "2.4.3";
+my $flowsetversion = "2.4.1";
 
 
 
@@ -1127,7 +1127,7 @@ sub AMAD_CommBridge_Read($) {
     my $c;
     my $device = $header->{FHEMDEVICE} if(defined($header->{FHEMDEVICE}));
     my $fhemcmd = $header->{FHEMCMD} if(defined($header->{FHEMCMD}));
-    my $dhash = $defs{$device} if( $defs{$device} );
+    my $dhash = $defs{$device} if(defined($device));