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Can you create the plunkr to reproduce this issue or you can try this,
Linear Scale config
var chartInstance = new Chart(ctx, {
type: 'line',
data: data,
options: {
scales: {
yAxes: [{
ticks: {
max: 5,
min: 0,
stepSize: 0.5
}
}]
}
}
});
Source:stackexchange.com