diff --git a/CollectionFrame.java b/CollectionFrame.java
index 6f05f8b..a2656bc 100644
--- a/CollectionFrame.java
+++ b/CollectionFrame.java
@@ -50,7 +50,7 @@ class CollectionFrame extends JComponent {
     {
         if (JOptionPane.showConfirmDialog(null, "Delete Tanker?", "Delete", JOptionPane.YES_NO_OPTION) == JOptionPane.OK_OPTION)
         {
-            if (_tanks.minus(Integer.parseInt(text)))
+            if (_tanks.minus(Integer.parseInt(text)) != null)
             {
                 JOptionPane.showMessageDialog(null, "Объект удален", "Информация", JOptionPane.INFORMATION_MESSAGE);
                 super.repaint();