diff --git a/js/dashboard.js b/js/dashboard.js
index 4cb3cd9..a19f4ea 100644
--- a/js/dashboard.js
+++ b/js/dashboard.js
@@ -249,10 +249,10 @@ class BlueWeatherDashboard {
 
   loadDiagram(parentId, locationData, sensorId) {
     if(typeof(parentId) === "string"){
-      mainContent = document.getElementById(parentId)
+      var mainContent = document.getElementById(parentId)
     }
     else {
-      mainContent = parentId
+      var mainContent = parentId
     }
     
     // get all relevant  meassurement values