I accidentally called my real dad by my step dads name...?

So my dad called and I was telling him about my plans with my cousin and my step dad to go snorkeling. Near the end of the conversation I ended with "Cya Bart" which is my step dads name. Now, I dont think he heard me because I tried morphing Bart into "buddy." Right now im feeling very awkward and I dont know what to do. Should I feel bad? Or is it just a common mistake to mix up names.