Effectless type error when trying to map an array in a formatted field

Hello there !

I get an "Uncaught TypeError: cell.map is not a function" each time I edit the cell (but no error when the component mounts). Although the error seems to have no effect (updating the data and formatting the cell work perfectly), I'd really like to know how I could achieve this in a cleaner way.

Thanks for your answers !

```
function contentCell(cell, row){
return

{cell.map(step=> (

1. {step}

))}