diff --git a/AirBomber/AirBomber/FormMapWithSetAirplanes.cs b/AirBomber/AirBomber/FormMapWithSetAirplanes.cs
index 1b88ac8..9748436 100644
--- a/AirBomber/AirBomber/FormMapWithSetAirplanes.cs
+++ b/AirBomber/AirBomber/FormMapWithSetAirplanes.cs
@@ -55,7 +55,7 @@
             if (form.ShowDialog() == DialogResult.OK)
             {
                 DrawningObject airplane = new(form.SelectedAirplane);
-                if (form.SelectedAirplane == null || !(_mapAirplanesCollectionGeneric + airplane))
+                if (form.SelectedAirplane == null || (_mapAirplanesCollectionGeneric + airplane) == -1)
                 {
                     MessageBox.Show("Не удалось добавить объект");
                 }
@@ -82,7 +82,7 @@
                 return;
             }
             int pos = Convert.ToInt32(maskedTextBoxPosition.Text);
-            if (_mapAirplanesCollectionGeneric - pos)
+            if (_mapAirplanesCollectionGeneric - pos != null)
             {
                 MessageBox.Show("Объект удален");
                 pictureBox.Image = _mapAirplanesCollectionGeneric.ShowSet();