I was watching a video regarding design patterns and the youtuber made an example of the builder pattern... I didn't know about the pattern(there is a reason why I was watching the videos); But I had encounter the same type of problems so what I usually did was to return null to the fields I didn’t had their data.

Is it wrong what I was doing?

At the end the builder will make the object with a null data and realistically it takes the same amount of code...