diff --git a/examples/mqtt.py b/examples/mqtt.py
index 7a70883..b059806 100644
--- a/examples/mqtt.py
+++ b/examples/mqtt.py
@@ -117,6 +117,8 @@ def on_message(client, userdata, msg):
         line = 60
 
     print(line)
+    if value_pvProduction == "":
+        value_pvProduction = ""
     print(value_pvProduction)
     print(value_wHouseConsumption)
     print(value_energyImportExport)