if (part_cnt <= 1)
{
- sh_off_t size = sbuck_ins_or_join(clist_head(&parts), list_pos, join, join_size);
+ sh_off_t size = sbuck_ins_or_join(clist_head(&parts), list_pos, (part_cnt ? NULL : join), join_size);
SORT_XTRACE(trace_level, "Sorted in memory (%s, %dMB/s)", stk_fsize(size), sorter_speed(ctx, size));
return;
}