diff --git a/Sailboat/Sailboat/FormBoatCollection.cs b/Sailboat/Sailboat/FormBoatCollection.cs
index 2570d28..fb973af 100644
--- a/Sailboat/Sailboat/FormBoatCollection.cs
+++ b/Sailboat/Sailboat/FormBoatCollection.cs
@@ -91,6 +91,10 @@ namespace Sailboat
                 MessageBox.Show(ex.Message);
                 _logger.LogWarning($"{ex.Message} в наборе {listBoxStorages.SelectedItem.ToString()}");
             }
+            catch (ArgumentException ex)
+            {
+                MessageBox.Show(ex.Message);
+            }
         }
 
         private void buttonRemoveBoat_Click(object sender, EventArgs e)
diff --git a/Sailboat/Sailboat/SetGeneric.cs b/Sailboat/Sailboat/SetGeneric.cs
index 5ed07e7..1dccf14 100644
--- a/Sailboat/Sailboat/SetGeneric.cs
+++ b/Sailboat/Sailboat/SetGeneric.cs
@@ -56,7 +56,7 @@ namespace Sailboat.Generics
                 throw new StorageOverflowException(_maxCount);
 
             if (equal != null && _places.Contains(boat, equal))
-                return false;
+                throw new ArgumentException("Данный объект уже есть в коллекции");
             _places.Insert(0, boat);
             return true;
         }