- for (vsize i = infos_.size () - 1; i--;)
- if (infos_[i].invisible_)
- {
- int b = min (infos_[i].count (LEFT), infos_[i + 1].count (LEFT));
- infos_[i].beam_count_drul_[LEFT] = b;
- infos_[i].beam_count_drul_[RIGHT] = b;
- }
+ if (infos_.size () > 1)
+ for (vsize i = infos_.size () - 1; i--;)
+ if (infos_[i].invisible_)
+ {
+ int b = min (infos_[i].count (LEFT), infos_[i + 1].count (LEFT));
+ infos_[i].beam_count_drul_[LEFT] = b;
+ infos_[i].beam_count_drul_[RIGHT] = b;
+ }