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I keep getting a stackOverflow error in my quickSort and I can not figure out why. Any help would be greatly appreciated!!

```
private static void quickSortRecPriv(int[] arr, int first, int last, int ps) {
int pivot = arr[first];
int left = first;
int right = last;
if (arr == null || first < 0 || last >= arr.length - 1) {
throw new IllegalArgumentException();
}
if (arr.length < 1)
{
return;
}
if(arr.length < ps)
{
InsertionSorter.insertionSort(arr);
return;
}
while ( true )
{
while ( arr[left] < pivot )
left++;
while ( arr[right] > pivot )
right--;
if ( left < right )
{ int t = arr[left];
arr[left++] = arr[right];
arr[right--] = t;
}
else
break;
}
pivot = partition(arr, first, last, ps);
quickSortRecPriv(arr, first, right, ps);
quickSortRecPriv(arr, right + 1, last, ps);
}
private static int partition(int[] arr, int first, int last, int ps) {
if (first == last) return first;
int i = first - 1;
int j = last;
while (true) {
while (arr[++i] < arr[last])
;
while (arr[last] < arr[--j])
if (j == first) break;
if (i >= j) break;
swap(arr, i, j);
}
swap(arr, i, last);
return i;
}
```