Uncaught TypeError: Cannot read property 'transition' of null
at Chart.transition (Chart.js:4427)
at Chart.draw (Chart.js:4394)
at Chart.render (Chart.js:4367)
at Object.callback (Chart.js:9929)
at Object.advance (Chart.js:3816)
at Object.startDigest (Chart.js:3789)
at Chart.js:3771