If I didn't realize I had claimed the American Opportunity Credit the year before, and filed this as my first year, will this cause an issue with my refund?

I am worried this is going to delay my receiving my refund and/or get me in hot water. I did some research, and it was suggested the IRS usually catches little errors like this themselves and remedy it - plus, I still qualify for the credit since it's only my second year. Am I just panicking over nothing? I really don't want to have to amend my whole return through mail for this.