diff --git a/server/gameserver/room.cc b/server/gameserver/room.cc
index 9879ce1..fdf5b5d 100644
--- a/server/gameserver/room.cc
+++ b/server/gameserver/room.cc
@@ -1299,7 +1299,11 @@ void Room::UpdateGasMoving()
                 gas_data_.pos_old = gas_data_.pos_old_bk + dir * distance;
             }
             if (gas_data_.rad_old - distance <= gas_data_.rad_new) {
+                #if 1
+                assert(gas_data_.rad_old - distance <= gas_data_.rad_new + 5);
+                #else
                 assert(gas_data_.pos_new == gas_data_.pos_old);
+                #endif
             }
         }
         if (std::abs(gas_data_.gas_progress - gas_data_.rad_new) <= 0.001f) {