Type error on series removing and adding with Boost enabled

[jedrzejruta]

Expected behaviour

There isn't any error logged in the console.

Actual behaviour

Uncaught TypeError: Cannot read properties of undefined (reading 'findNearestPointBy') is logged into browser console.

Live demo with steps to reproduce

https://jsfiddle.net/BlackLabel/3rfjnu7g/

Click on the "Add new line series" button. In most cases, it shouldn't throw an error, but if you click on the button before the KD-Tree is built, the error appears.

Product version

Tested up to Highcharts v.8