When I am creating a new customer, after filling all necessary details I am getting this error message "Invalid value passed for attention" . I am not able to figure out what is causing this.

When I am creating a new customer, after filling all necessary details I am getting this error message "Invalid value passed for attention" . I am not able to figure out what is causing this.

I haven't done anything different from other times but not sure why it wont let me save the new customer.