customHeadRender not working

Hi, I am trying to use `customHeadRender` in order to use my own icon. I keep getting this bug despite following the documentation on how write the `customHeadRender`.

Here is how my `customHeadRender` is written as:

` customHeadRender: (columnMeta, handleToggleColumn, sortOrder) => {
return (


Last Modified


)
}`

Whenever I click on the `TableSortLabel`, I expect the `handleToggleColumn` function to run and sort the list. But instead, I get this bug:


`TypeError: a[d] is undefined`

Is there a way to fix this. Are there any examples on how to do `customHeadRender`?

Start by reproducing the reported customHeadRender case using the shown TableCell, TableSortLabel, and handleToggleColumn entry points. Confirm that clicking the label sorts the list without the reported TypeError; document or test the working customHeadRender usage once the behavior is corrected.

Written by the indexing model from the issue text.