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You need to set default values for mouth witch don’t want use example – 0 :
data: {
datasets: [{
label: 'First dataset',
data: [0, 20, 40, 50, 0, 20, 40, 50, 0, 20, 40, 50]
},
{
label: 'Second dataset',
data: [0, 0, 0, 0, 0, 20, 40, 50, 0, 20, 40, 50]
}],
labels: ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December']
},
i founded exemple here we can use data value – null and it make empty space for this range
Source:stackexchange.com