The percentage for sitemap.xml/undefined is NaN%. This value shows up when the denominator is missing or cannot be interpreted, so the fraction cannot be turned into a normal number.
A fraction like sitemap.xml/undefined means we are trying to divide something by nothing. In math, dividing by zero or an undefined term does not give a real result, so it’s considered “not a number.” That’s why the fraction itself is meaningless in a standard sense.
When we try to express this meaningless fraction as a percentage, the result stays “not a number,” which we write as NaN%. It reminds us that some calculations simply cannot be completed because the original values are not defined.
