Both Skew and SAIS crashes on simple data set. Only Naive works. See test code

#include "Skew.h"
#include "SAIS.h"
#include "Naive.h"

int main()
{
    std::string data;
    data.reserve(2 * 256);

    for(int i = 0;i < (256 * 2);i++) {
        data += (i % 256);
    }

//    Naive s;
    Skew s;
//    SAIS s;
    s.addString(data);
    s.makeSuffixArray();
    s.printSuffixArray();
    std::cout << std::endl;
}