Checked the size of phase2_results before accessing phase2_results.front()
Checked the size of phase2_results before accessing phase2_results.front()

quinonez/istar,HongjianLi/istar,HongjianLi/istar,HongjianLi/istar,quinonez/istar,quinonez/istar,quinonez/istar,HongjianLi/istar