diff --git a/server/gameserver/ingamevoice.cc b/server/gameserver/ingamevoice.cc
index 62aff61c..40011ebd 100644
--- a/server/gameserver/ingamevoice.cc
+++ b/server/gameserver/ingamevoice.cc
@@ -28,6 +28,16 @@ static int GetIntMap(std::map<int, int>& int_map, int key)
     }
 }
 
+static int GetInt64Map(std::map<int, long long>& int_map, int key)
+{
+    auto itr = int_map.find(key);
+    if (itr != int_map.end()) {
+        return itr->second;
+    } else {
+        return 0;
+    }
+}
+
 InGameVoice::InGameVoice(Room* room)
 {
     room_ = room;
@@ -60,10 +70,11 @@ void InGameVoice::OnHumanBeKill(int killer_id, Human* deader)
     }
     ++global_kills_;
     if (global_kills_ > 0) {
-        if (room_->GetFrameNo() - killer->stats->last_kill_frameno >
+        if (room_->GetFrameNo() - GetInt64Map(personal_last_kill_frameno_, killer_id) >
             SERVER_FRAME_RATE * mt::InGameVoice::s_series_kill_interval) {
             personal_series_kills_.erase(killer_id);
         }
+        personal_last_kill_frameno_[killer_id] = room_->GetFrameNo();
         IncIntMap(personal_kills_, killer_id);
         IncIntMap(personal_series_kills_, killer_id);
         if (!killer->dead) {
diff --git a/server/gameserver/ingamevoice.h b/server/gameserver/ingamevoice.h
index 59ffe84c..3f1c8a4a 100644
--- a/server/gameserver/ingamevoice.h
+++ b/server/gameserver/ingamevoice.h
@@ -34,5 +34,6 @@ private:
     std::map<int, int> personal_kills_;
     std::map<int, int> personal_series_kills_;
     std::map<int, int> personal_nodead_series_kills_;
+    std::map<int, long long> personal_last_kill_frameno_;
 
 };