fixed temperatures hopefully

app/client/log.js

@@ -20,11 +20,11 @@ Template.log.events({
   }
 });
 
-
+var tempHolder = {};
 
 var createChart = function() {
 
-  var self = this;
+  var self = tempHolder;
   self.labels = [];
   self.temperatures = [];
   Tracker.autorun(function() {
@@ -41,6 +41,8 @@ var createChart = function() {
     });
   });
 
+  if(self.temperatures.length <= 0) { return; } /// there are no temperatures
+
 
   // Get the context of the canvas element we want to select
   var chartCanvas = document.getElementById("temperatureChart");