diff --git a/server/gameserver/human.cc b/server/gameserver/human.cc
index db7ff05..6981ad4 100644
--- a/server/gameserver/human.cc
+++ b/server/gameserver/human.cc
@@ -2111,6 +2111,9 @@ void Human::ProcSkillPhase(MetaData::SkillPhase* phase)
                 if (bullet_meta->i->equip_subtype() == kBulletType_Trace) {
                     Human* skill_target = room->GetHumanByUniId(skill_target_id);
                     if (skill_target) {
+                        if (skill_target->pos.Distance(pos) < 0.00001f) {
+                            return;
+                        }
                         attack_dir = skill_target->pos - pos;
                         attack_dir.Normalize();
                     }