Hey @vacho,
Thanks for reaching out!
This seems like you’re creating the item via Zapier, is that correct? If so, this error is most likely caused by a Dropdown column without any Labels in your board.
Could you please check if you have columns of the type “dropdown” with no labels available and if you do, add at least one label, refresh the Zapier tab and try again? (you do not need to actually select the label you create in any item, just create the label).
Adding labels and then re-selecting the board or refreshing fields should do the trick for you 
We are planning to fix this in the future, too.
-Alex