Removing NaN warning messages after curvefit?

Quick one, sometimes my curvefits will throw a NaN (Not a Number?) warning after completion. I can look back and see which fit produced the NaNs. I've written some error catching code which looks for and reanalyzes fits that give NaN values so that there are no NaNs in the final fits, but the program still gives me the warning after it ends, (even though the waves with the NaN have been overwritten). I would like to stop this (as it makes it seem like my program in throwing an error, when in fact it catches it and corrects it.) This is purely cosmetic, but if it's possible, I'd still like to do it.

The second half of the error says this:
"The fitting function returned NaN for at least one X value."

I apologize if this has already been discussed, I'm not having any luck with the search.