diff --git a/server/gameserver/room.cc b/server/gameserver/room.cc
index 3f9538a..a76f37f 100644
--- a/server/gameserver/room.cc
+++ b/server/gameserver/room.cc
@@ -3969,14 +3969,16 @@ void Room::AirRaid(int airraid_id)
                           );
                      a8::Vec2 dir = a8::Vec2::UP;
                      dir.Rotate(a8::RandAngle());
-                     a8::Vec2 pos = center +  dir * (50 + rand() % 100);;
-                     RoomObstacle* obstacle = room->CreateObstacle
-                         (
-                          raid_meta->i->bomb_id(),
-                          pos.x,
-                          pos.y
-                          );
-                     obstacle->Active();
+                     a8::Vec2 pos = center +  dir * (50 + rand() % 100);
+                     if (room->grid_service->CanAdd(pos.x, pos.y)) {
+                         RoomObstacle* obstacle = room->CreateObstacle
+                             (
+                              raid_meta->i->bomb_id(),
+                              pos.x,
+                              pos.y
+                              );
+                         obstacle->Active();
+                     }
                  };
              Room* room = (Room*)param.sender.GetUserData();
              if (room->IsGameOver()) {