diff --git a/AirBomber/AirBomber/DrawningObject.cs b/AirBomber/AirBomber/DrawningObject.cs
index d79a291..dca9b4d 100644
--- a/AirBomber/AirBomber/DrawningObject.cs
+++ b/AirBomber/AirBomber/DrawningObject.cs
@@ -34,7 +34,7 @@ namespace AirBomber
 
         void IDrawningObject.DrawningObject(Graphics g)
         {
-            _airplane.DrawTransport(g);
+            _airplane?.DrawTransport(g);
         }
     }
 }
diff --git a/AirBomber/AirBomber/FormMapWithSetAirplanes.Designer.cs b/AirBomber/AirBomber/FormMapWithSetAirplanes.Designer.cs
index ed972c8..8d581aa 100644
--- a/AirBomber/AirBomber/FormMapWithSetAirplanes.Designer.cs
+++ b/AirBomber/AirBomber/FormMapWithSetAirplanes.Designer.cs
@@ -162,7 +162,7 @@
             this.comboBoxSelectorMap.DropDownStyle = System.Windows.Forms.ComboBoxStyle.DropDownList;
             this.comboBoxSelectorMap.FormattingEnabled = true;
             this.comboBoxSelectorMap.Items.AddRange(new object[] {
-            "Простая карта"});
+            "Простая карта", "Карта со стенами"});
             this.comboBoxSelectorMap.Location = new System.Drawing.Point(17, 32);
             this.comboBoxSelectorMap.Name = "comboBoxSelectorMap";
             this.comboBoxSelectorMap.Size = new System.Drawing.Size(175, 23);
diff --git a/AirBomber/AirBomber/FormMapWithSetAirplanes.cs b/AirBomber/AirBomber/FormMapWithSetAirplanes.cs
index 9676d84..def5d4e 100644
--- a/AirBomber/AirBomber/FormMapWithSetAirplanes.cs
+++ b/AirBomber/AirBomber/FormMapWithSetAirplanes.cs
@@ -26,6 +26,9 @@
                 case "Простая карта":
                     map = new SimpleMap();
                     break;
+                case "Карта со стенами":
+                    map = new WallMap();
+                    break;
             }
             if (map != null)
             {
@@ -52,14 +55,14 @@
             if (form.ShowDialog() == DialogResult.OK)
             {
                 DrawningObject airplane = new(form.SelectedAirplane);
-                if (_mapAirplanesCollectionGeneric + airplane)
+                if (form.SelectedAirplane == null || !(_mapAirplanesCollectionGeneric + airplane))
                 {
-                    MessageBox.Show("Объект добавлен");
-                    pictureBox.Image = _mapAirplanesCollectionGeneric.ShowSet();
+                    MessageBox.Show("Не удалось добавить объект");
                 }
                 else
                 {
-                    MessageBox.Show("Не удалось добавить объект");
+                    MessageBox.Show("Объект добавлен");
+                    pictureBox.Image = _mapAirplanesCollectionGeneric.ShowSet();
                 }
             }
         }
diff --git a/AirBomber/AirBomber/MapWithSetAirplanesGeneric.cs b/AirBomber/AirBomber/MapWithSetAirplanesGeneric.cs
index e54e7a8..63bb08f 100644
--- a/AirBomber/AirBomber/MapWithSetAirplanesGeneric.cs
+++ b/AirBomber/AirBomber/MapWithSetAirplanesGeneric.cs
@@ -78,7 +78,7 @@ namespace AirBomber
             Bitmap bmp = new(_pictureWidth, _pictureHeight);
             Graphics gr = Graphics.FromImage(bmp);
             DrawBackground(gr);
-            Drawairplanes(gr);
+            DrawAirplanes(gr);
             return bmp;
         }
         /// <summary>
@@ -158,7 +158,7 @@ namespace AirBomber
         /// Метод прорисовки объектов
         /// </summary>
         /// <param name="g"></param>
-        private void Drawairplanes(Graphics g)
+        private void DrawAirplanes(Graphics g)
         {
             for (int i = 0; i < _setAirplanes.Count; i++)
             {
diff --git a/AirBomber/AirBomber/SetAirplanesGeneric.cs b/AirBomber/AirBomber/SetAirplanesGeneric.cs
index 0848595..178d798 100644
--- a/AirBomber/AirBomber/SetAirplanesGeneric.cs
+++ b/AirBomber/AirBomber/SetAirplanesGeneric.cs
@@ -41,7 +41,7 @@ namespace AirBomber
 
         private bool isCorrectPosition(int position)
         {
-            return 0 < position && position <= Count;
+            return 0 <= position && position < Count;
         }
         /// <summary>
         /// Добавление объекта в набор на конкретную позицию