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There seems to be an issue with the plugin. TRY using the following one :
plugins: [{
beforeDraw: function(chart) {
var labels = chart.data.labels;
labels.forEach(function(e, i) {
var meta = chart.data.datasets[0]._meta;
var bar = meta[Object.keys(meta)[0]].data[i]._model;
var dataPoint = e.split(/\s/)[1];
if (dataPoint === '12') bar.backgroundColor = 'blue';
else if (dataPoint === '13') bar.backgroundColor = 'green';
});
}
}]
Source:stackexchange.com