We have contacts with recordtype x, y and blank. I would want to update contacts with recordtype x and blank to y using a process builder. So, in the formula for the process builder, I used the OR condition - (OR[Contact].RecordType.Id =<18 digit ID>, ISBLANK([Contact].Record type.Id)). Also tried with recordtype <>y. Have also tried using the condition.
It works when the record type is not null. But when I try updating a record with a null record type, it errors.