Fixed double opening bug

src/gui/menubar/MenuBar.java

@@ -71,7 +71,7 @@ public class MenuBar extends JMenuBar{
 			public void actionPerformed(ActionEvent arg0) {
 				try {
 					Agenda agenda= Io.readIo();
-					if(Io.readIo() != null){
+					if(agenda != null){
 						mainFrame.setAgenda(agenda);
 						System.out.println("read");
 					}