diff --git a/fhem/FHEM/98_openweathermap.pm b/fhem/FHEM/98_openweathermap.pm
index d2a6bb8a4..c044ad63a 100644
--- a/fhem/FHEM/98_openweathermap.pm
+++ b/fhem/FHEM/98_openweathermap.pm
@@ -334,7 +334,9 @@ UpdateReadings($$$){
 		$jsonWeather = $json->decode($response);
 	} catch {
 		Log $loglevel, "openweather $name error: JSPON decode";
-		return;
+		return undef;
+	} finally {
+		return undef;
 	};
 
 	readingsBeginUpdate($hash);