diff --git a/fhem/CHANGED b/fhem/CHANGED
index 225bdb0eb..f49b7085c 100644
--- a/fhem/CHANGED
+++ b/fhem/CHANGED
@@ -1,5 +1,8 @@
 # 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.
+  - bugix:   14_Hideki:  fixed wrong return in ParseFn (msg533900)
+             14_SD_WS:   fixed wrong return in ParseFn (msg533900)
+             90_SIGNALduino_un:   fixed wrong return in ParseFn (msg533900)
   - change:  93_DbRep: change of day aggregation
   - bugfix:  93_DbRep: Syntaxerror due to Forum #msg529312
   - bugfix:  74_AMAD: 74_AMADautomagicFlowset_2.6.7.xml fix Problems with zero
diff --git a/fhem/FHEM/14_Hideki.pm b/fhem/FHEM/14_Hideki.pm
index 183188681..c594c54a5 100644
--- a/fhem/FHEM/14_Hideki.pm
+++ b/fhem/FHEM/14_Hideki.pm
@@ -124,7 +124,7 @@ Hideki_Parse($$)
 	}
 	else{
 		Log3 $iohash, 4, "$name Sensor Typ $sensorTyp not supported, please report sensor information!";
-		return "$name Sensor Typ $sensorTyp not supported, please report sensor information!";
+		return "";
 	}
 	my $longids = AttrVal($iohash->{NAME},'longids',0);
 	if ( ($longids ne "0") && ($longids eq "1" || $longids eq "ALL" || (",$longids," =~ m/,$model,/)))
diff --git a/fhem/FHEM/14_SD_WS.pm b/fhem/FHEM/14_SD_WS.pm
index aff34c95e..218e61dfc 100644
--- a/fhem/FHEM/14_SD_WS.pm
+++ b/fhem/FHEM/14_SD_WS.pm
@@ -175,8 +175,8 @@ sub SD_WS_Parse($$)
 	 
 	 	   	$SensorTyp=$decodingSubs{$protocol}{sensortype};
 		    
-		    return "Prematch Error" && Log3 $iohash, 4, "$name decoded protocolid: $protocol ($SensorTyp) prematch error" if (!$decodingSubs{$protocol}{prematch}->( $rawData ));
-		    return "crc Error" && Log3 $iohash, 4, "$name decoded protocolid: $protocol ($SensorTyp) crc  error"  if (!$decodingSubs{$protocol}{crcok}->( $rawData ));
+		    return "" && Log3 $iohash, 4, "$name decoded protocolid: $protocol ($SensorTyp) prematch error" if (!$decodingSubs{$protocol}{prematch}->( $rawData ));
+		    return "" && Log3 $iohash, 4, "$name decoded protocolid: $protocol ($SensorTyp) crc  error"  if (!$decodingSubs{$protocol}{crcok}->( $rawData ));
 		    
 	    	$id=$decodingSubs{$protocol}{id}->( $rawData,$bitData );
 	    	#my $temphex=$decodingSubs{$protocol}{temphex}->( $rawData,$bitData );
@@ -191,13 +191,13 @@ sub SD_WS_Parse($$)
 		
 	} 
 	else {
-		Log3 $iohash, 4, "SD_WS_Parse_unknown: converted to bits: $bitData";
-		return $dummyreturnvalue;
+		Log3 $iohash, 4, "SD_WS_Parse: unknown message, please report. converted to bits: $bitData";
+		return undef;
 	}
 
 
 	if (!defined($model)) {
-		return $dummyreturnvalue;
+		return undef;
 	}
 	
 	my $deviceCode;
diff --git a/fhem/FHEM/90_SIGNALduino_un.pm b/fhem/FHEM/90_SIGNALduino_un.pm
index 6799e4ff8..23c3c3d98 100644
--- a/fhem/FHEM/90_SIGNALduino_un.pm
+++ b/fhem/FHEM/90_SIGNALduino_un.pm
@@ -308,11 +308,13 @@ SIGNALduino_un_Parse($$)
 
 	
 	} else {
-		return $dummyreturnvalue;
+		Log3 $hash, 4, $dummyreturnvalue;
+		
+		return undef;
 	}
 
-	
-	return $dummyreturnvalue;  # This prevents unkown code Messages in our log
+	Log3 $hash, 4, $dummyreturnvalue;
+	return undef;  
 }