Concatenate text fields put NaN in field

[Lynda_Stringer]

I.m new to Airtable. I’m trying to concatenate the nickname if the field isn’t empty or the first name if no nick name then a space then the last name. It puts NaN in the field. Here is my code in a formula field:
CONCATENATE(IF(nickname="",First,nickname)+" "+Last)

[Esabatad_Daeh · Accepted solution]

Hi Lynda,

Try replacing your + characters with & symbols.
See if that helps. :blush:

[Lynda_Stringer]

That worked, thanks so much.