diff --git a/examples/mqtt.py b/examples/mqtt.py
index b059806..a5c0442 100644
--- a/examples/mqtt.py
+++ b/examples/mqtt.py
@@ -117,8 +117,6 @@ def on_message(client, userdata, msg):
         line = 60
 
     print(line)
-    if value_pvProduction == "":
-        value_pvProduction = ""
     print(value_pvProduction)
     print(value_wHouseConsumption)
     print(value_energyImportExport)
@@ -131,6 +129,12 @@ client = mqtt_client.Client(client_id, protocol=paho.MQTTv31)
 client.username_pw_set(username, password=pw)
 client.on_connect = on_connect
 
+value_pvProduction = ""
+value_wHouseConsumption = ""
+value_energyImportExport = ""
+topic_houseBatterySoC = ""
+topic_houseBatteryLoadUnload = ""
+
 client.on_message = on_message
 
 client.connect(broker, port=port)