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you might want to delay the time you set the actual value and set it only after the initial graph is loaded.
setInterval(function() {
data.datasets[0].data[1] = 60;
data.datasets[0].backgroundColor[1] = "#F7464A";
promisedDeliveryChart.update();
}, 1000);
Here is how it looks in action: https://jsfiddle.net/u8goLmgt/2/
Source:stackexchange.com