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I had the same problem for fill: false.
Version (library) 1 of chartjs has important differences to version 2 in terms of usability. Fine references are: . version 1: https://blog.ruanbekker.com/blog/2017/12/14/graphing-pretty-charts-with-python-flask-and-chartjs/ . version 2: https://towardsdatascience.com/flask-and-chart-js-tutorial-i-d33e05fba845
Source:stackexchange.com