getElementsAtEventForMode() of chartJS 3.0

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I'm trying to get elements on click event. Both line and bar data can be null.

My question is getElementsAtEventForMode() is not working as expected When line data is null.

// Same result.
const elements = myChart.getElementsAtEventForMode(e, 'index', { intersect: false }, false);
const element1 = myChart.getElementsAtEventForMode(e, 'nearest', { intersect: false, axis: 'x' }, false);

Please check attached image for detail (where I clicked on chart area).

Can I get some help for this issue?

https://codepen.io/wsjraphael/pen/VwyOXdL

enter image description here

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