is this Gwt Java google bug- redundant removecall error of HandlerRegistration?

ok, I have a button & when clicking that button it will call this methodX

       public void methodX(){              CheckBox cb=new CheckBox();              HandlerRegistration reg=cb.addClickHandler(new ClickHandler(){                    @Override                  public void onClick(ClickEvent event) {                      // TODO Auto-generated method stub                      int x=1;                  }                });              if(reg!=null){                  reg.removeHandler();              }          }

The above methoxX runs ok. There no error whatsoever when i click the button 1 time or many times. However if I change the methodX a bit

       public void methodX(){              CheckBox cb=new CheckBox();              HandlerRegistration reg=cb.addClickHandler(new ClickHandler(){                    @Override                  public void onClick(ClickEvent event) {                      // TODO Auto-generated method stub                      int x=1;                  }                });              if(reg!=null){                  reg.removeHandler();              }                ///add these lines of code              if(reg!=null){                  reg.removeHandler();              }          }

Now when clicking the button I got this error

Uncaught exception escaped  com.google.gwt.event.shared.UmbrellaException: Exception caught: redundant remove call      at com.google.gwt.event.shared.HandlerManager.fireEvent(HandlerManager.java:129)

Is there anyway to control this or this is Google bug?

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