diff --git a/pool.js b/pool.js
index 355ab3d..73198b8 100644
--- a/pool.js
+++ b/pool.js
@@ -295,7 +295,10 @@ MQTT.subscribe(
   "zigbee2mqtt/Piscine",
   function (topic, msg) {
     status.tick_mqtt++;
-    print("[POOL] mqtt", topic);
+    print("[POOL] mqtt", topic, msg);
+    if (msg == "") {
+      return;
+    }
     let obj = JSON.parse(msg);
     if (obj.temperature === undefined) {
       return;