diff --git a/app/server/methods.js b/app/server/methods.js
index b4c0623..55c5d18 100644
--- a/app/server/methods.js
+++ b/app/server/methods.js
@@ -214,7 +214,8 @@ reactToAlarmData = function(controller_id) {
   };
 
   var temperatures = (reading.temperatures || []).filter(function(temperature, index) {
-    return Meteor.zoblak.shared.valid_temperature(temperature) && config.sensorsEnabled[index];
+    var is_on = (index in config.sensorsEnabled)?config.sensorsEnabled[index]: true;
+    return Meteor.zoblak.shared.valid_temperature(temperature) && is_on;
   });