Op solved it closing ~~

n%n is always 0 ;-)

Does it work now?

Check for null before...

if(numbers == null)
{
  return new double[0];
}

As first call in the method.

numbers.length can be zero, so you can't create an array like new double[numbers.length-1] because numbers.length-1 may be negative.

What is the text of the error?

And please paste your code here (mark as spoiler!).

What language?
Do you check for null?