Rendering Grid from addon settings page

Oh, I should have noticed this before. Looks like you’re not setting a blank row. Take a look at the Table service docs again and see where we call $grid->setBlankRow(). Basically, you’ve set up the existing rows, but we have to know what you want a blank row to look like with empty data. The JS error is coming from not being able to find that blank row element to append to the Grid.

Thanks for getting back to me, I think that was the issue, yes.

I decided to go with a regular Table instead though - easier to implement and it had all I needed anyway.