CBP officer did not stamp my passport
I flew from spain to NYC a year ago for a week, to visit the city. At the airport, when i arrived in NYC, they didn't stamp my passport. I spent my week there and i came back to spain without problems.
Here is my question, I will visit NYC next december, and I would like to know if i could have any problem when i arrive at the JFK airport and they notice that my passport was not stamped in my last visit to the USA.
Thank you for your help!