diff --git a/AirBomber/AirBomber/FormMapWithSetAirplanes.cs b/AirBomber/AirBomber/FormMapWithSetAirplanes.cs
index 6b4eb6c..e9d9bfd 100644
--- a/AirBomber/AirBomber/FormMapWithSetAirplanes.cs
+++ b/AirBomber/AirBomber/FormMapWithSetAirplanes.cs
@@ -111,7 +111,7 @@
             if (form.ShowDialog() == DialogResult.OK)
             {
                 DrawningObject airplane = new(form.SelectedAirplane);
-                if (_mapsCollection[listBoxMaps.SelectedItem?.ToString() ?? string.Empty] + airplane)
+                if (_mapsCollection[listBoxMaps.SelectedItem?.ToString() ?? string.Empty] + airplane != -1)
                 {
                     MessageBox.Show("Объект добавлен");
                     pictureBox.Image = _mapsCollection[listBoxMaps.SelectedItem?.ToString() ?? string.Empty].ShowSet();
@@ -142,7 +142,7 @@
                 return;
             }
             int pos = Convert.ToInt32(maskedTextBoxPosition.Text);
-            if (_mapAirplanesCollectionGeneric - pos != -1)
+            if (_mapsCollection[listBoxMaps.SelectedItem?.ToString() ?? string.Empty] - pos != null)
             {
                 MessageBox.Show("Объект удален");
                 pictureBox.Image = _mapsCollection[listBoxMaps.SelectedItem?.ToString() ?? string.Empty].ShowSet();