[Chartjs]-Unexpected text "NaN" appearing near y-axis of the Chart

3👍

✅

UPDATE:
This fix worked in chart.js version 2.5 (or lower), in version 2.6 they said it’s fixed by default.

OLD ANSWER:

Hello, just change to this: (notice my callback on xAxis)

var ctx = document.getElementById("myChart");
var myChart = new Chart(ctx, {
  type: 'horizontalBar',
  data: {
    labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
    datasets: [{
      label: 'Capital',
      data: [12, 19, 3, 5, 2, 3],
      backgroundColor: [
        'rgba(255, 99, 132, 0.2)',
        'rgba(54, 162, 235, 0.2)',
        'rgba(255, 206, 86, 0.2)',
        'rgba(75, 192, 192, 0.2)',
        'rgba(153, 102, 255, 0.2)',
        'rgba(255, 159, 64, 0.2)'
      ],
      borderColor: [
        'rgba(255,99,132,1)',
        'rgba(54, 162, 235, 1)',
        'rgba(255, 206, 86, 1)',
        'rgba(75, 192, 192, 1)',
        'rgba(153, 102, 255, 1)',
        'rgba(255, 159, 64, 1)'
      ],
      borderWidth: 1
    }, {
      label: 'Expense',
      data: [4, 8, 6, 14, 12, 6],
      backgroundColor: [
        'rgba(255, 99, 132, 0.2)',
        'rgba(54, 162, 235, 0.2)',
        'rgba(255, 206, 86, 0.2)',
        'rgba(75, 192, 192, 0.2)',
        'rgba(153, 102, 255, 0.2)',
        'rgba(255, 159, 64, 0.2)'
      ],
      borderColor: [
        'rgba(255,99,132,1)',
        'rgba(54, 162, 235, 1)',
        'rgba(255, 206, 86, 1)',
        'rgba(75, 192, 192, 1)',
        'rgba(153, 102, 255, 1)',
        'rgba(255, 159, 64, 1)'
      ],
      borderWidth: 1
    }]
  },
  options: {
    scales: {
      xAxes: [{
        stacked: true,
        ticks: {
          //this will fix your problem with NaN
          callback: function(label, index, labels) {
            return label ? label : '';
          }
        }
      }],
      yAxes: [{
        ticks: {
          beginAtZero: true
        }
      }]
    }
  }
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.5.0/Chart.bundle.js"></script>
<canvas id="myChart" width="400" height="400"></canvas>

Can’t really explain why is displaying that ‘NaN’, I think it’s still trying to display the ticks even when there is no data. So, in that callback you make sure that data is displayed only if exists.
I had the same problem on a chart and didn’t found any answer anywhere, so this fix is something I came up with on the fly, but it’s working. That callback is overriding ticks displayed data, so you can customize it as much as you want.

You can check this issue here too:
Chart js Github