diff --git a/server/gameserver/explosion.cc b/server/gameserver/explosion.cc
index 0f567e8..2918cbb 100644
--- a/server/gameserver/explosion.cc
+++ b/server/gameserver/explosion.cc
@@ -53,13 +53,13 @@ void Explosion::InternalAttack()
     if (explosion_range_ <= 0) {
         return;
     }
-    sender_.Get()->room->frame_event.AddExplosionEx
+    room_->frame_event.AddExplosionEx
         (sender_,
          0,
          center_,
          explosion_effect_);
     std::set<GridCell*> grid_list;
-    sender_.Get()->room->grid_service->GetAllCellsByXy
+    room_->grid_service->GetAllCellsByXy
         (
          room_,
          center_.x,