Table throwing Error when action is triggered on transformed data

Hi,

I have built a table which is using a transformer as its data source:


I have added an action button which sets a variable to the value of a column of the current row:

When I click the button without selecting that row first everything works fine. But when I select the row first and then click on the button I get an error in the console. The value of the variable is still set correctly:

I get the same error when I select the same row multiple times in a row.

I also recorded that behaviour here:

Thanks,
Alex