diff --git a/ArmoredCar/ArmoredCar/MapWithSetArmoredCarsGeneric.cs b/ArmoredCar/ArmoredCar/MapWithSetArmoredCarsGeneric.cs
index 036d62c..e4a7e64 100644
--- a/ArmoredCar/ArmoredCar/MapWithSetArmoredCarsGeneric.cs
+++ b/ArmoredCar/ArmoredCar/MapWithSetArmoredCarsGeneric.cs
@@ -176,8 +176,8 @@ namespace ArmoredCar
             int k = 0;
             foreach (var armoredCar in _setCars.GetCars())
             {                
-                armoredCar?.SetObject(k % width * _placeSizeWidth + 5, k / width * _placeSizeHeight + 10, _pictureWidth, _pictureHeight);
-                armoredCar?.DrawningObject(g);
+                armoredCar.SetObject(k % width * _placeSizeWidth + 5, k / width * _placeSizeHeight + 10, _pictureWidth, _pictureHeight);
+                armoredCar.DrawningObject(g);
                 k++;
             }          
         }
@@ -191,10 +191,7 @@ namespace ArmoredCar
             string data = $"{_map.GetType().Name}{separatorType}";
             foreach (var armoredCar in _setCars.GetCars())
             {
-                if (armoredCar != null)
-                    data += $"{armoredCar.GetInfo()}{separatorData}";
-                else
-                    data += $"null{separatorData}";
+                data += $"{armoredCar.GetInfo()}{separatorData}";
             }
             return data;
         }
@@ -206,10 +203,7 @@ namespace ArmoredCar
         {
             foreach (var rec in records)
             {
-                if (rec != "null")
-                    _setCars.Insert(DrawningObjectArmCar.Create(rec) as T);
-                else
-                    _setCars.Insert(null);
+                _setCars.Insert(DrawningObjectArmCar.Create(rec) as T);
             }
         }
     }
diff --git a/ArmoredCar/ArmoredCar/SetArmoredCarsGeneric.cs b/ArmoredCar/ArmoredCar/SetArmoredCarsGeneric.cs
index fabb0b3..6d63325 100644
--- a/ArmoredCar/ArmoredCar/SetArmoredCarsGeneric.cs
+++ b/ArmoredCar/ArmoredCar/SetArmoredCarsGeneric.cs
@@ -65,7 +65,7 @@ namespace ArmoredCar
             T armoredCar = _places[position];
             if (armoredCar == null)
                 throw new ArmoredCarNotFoundException(position);
-            _places[position] = null;
+            _places.RemoveAt(position);
             return armoredCar;
         }
         /// <summary>
@@ -98,15 +98,14 @@ namespace ArmoredCar
         {
             foreach (var car in _places)
             {
-                yield return car;
-                /*if (car != null)
+                if (car != null)
                 {
                     yield return car;
                 }
                 else
                 {
                     yield break;
-                }*/
+                }
             }
         }