if (!frq->n_percentiles)
return;
- vf->percentiles = xnmalloc (frq->n_percentiles, sizeof *vf->percentiles);
+ if (!vf->percentiles)
+ vf->percentiles = xnmalloc (frq->n_percentiles, sizeof *vf->percentiles);
const struct freq_tab *ft = &vf->tab;
const double W = ft->valid_cases;