diff --git a/Crypto Notepad/Form1.cs b/Crypto Notepad/Form1.cs
index bb6cf1c..cc9864f 100644
--- a/Crypto Notepad/Form1.cs	
+++ b/Crypto Notepad/Form1.cs	
@@ -106,6 +106,10 @@ void DecryptAES()
                     {
                         DecryptAES();
                     }
+                    if (dialogResult == DialogResult.Cancel)
+                    {
+                        publicVar.encryptionKey.Set(null);
+                    }
                 }
             }
         }