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you are using a very old version of chart.js (as a matter of fact, the first ever released).
You could solve this by replacing:
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/0.2.0/Chart.min.js" type="text/javascript"></script>
with
<script src="https://cdn.jsdelivr.net/npm/chart.js"></script>
Fixed versions can also be found, e.g. here.
Source:stackexchange.com