Also remove the last entry of the select

renderer.js

@@ -49,7 +49,7 @@ function refreshSerialPorts()
     select = document.getElementById('portsSelect');
 
     //Clear the current options
-    for (i = 0; i <= select.options.length; i++) 
+    while (select.options.length)
     {
         select.remove(0); //Always 0 index (As each time an item is removed, everything shuffles up 1 place)
     }