diff --git a/AirBomber/AirBomber/SetAirplanesGeneric.cs b/AirBomber/AirBomber/SetAirplanesGeneric.cs
index 41ddb96..097d88f 100644
--- a/AirBomber/AirBomber/SetAirplanesGeneric.cs
+++ b/AirBomber/AirBomber/SetAirplanesGeneric.cs
@@ -71,7 +71,7 @@ namespace AirBomber
             if (!isCorrectPosition(position))
                 return null;
             var result = _places[position];
-            _places[position] = null;
+            _places.RemoveAt(position);
             return result;
         }
         /// <summary>