Where are you located? In about half the country, it's illegal to ask how much you are currently making. Even if you are located where it's legal, I HATE this question and advise people to not answer it. But I don't advise people to just not answer at all. You should respond with the salary you are seeking like, "Based on market rates and my experience, I am seeking a salary of $X." Like a real number based upon the market rate of similar positions in your area and your experience. It is a waste of everyone's time to proceed if you will not accept anything under $150K, but they are unable to offer anything over $120K. If you are eventually offered a position, and find out during the process that it will involve more responsibilities than you realized, then negotiate based on that. But don't just not answer the question at all.

So while I get and appreciate you not wanting to disclose what you are currently making, since it's really only used to low-ball people on offers, I don't understand why you refused to offer your salary expectations, as I don't see any reason to not give that information.

FWIW, I've worked in HR for decades.