Bug with settings menu opacity [FIXED]

cocos2d-x C++
#1

Hi All,
Found a bug with settings the menu opacity.
The following change fixed it (File: cocos2dx\menu_nodes\CCMenuItem.cpp ) :

void CCMenuItemLabel::setOpacity(GLubyte opacity)
{
CCRGBAProtocol* node = dynamic_cast<CCRGBAProtocol*>(m_pLabel);
if (node)
{
node->setOpacity(opacity);
}
}

#2

What is the bug?

#3

In the original function there is no check if the cast fails and returns NULL.
http://www.cocos2d-x.org/projects/cocos2d-x/repository/revisions/master/entry/cocos2dx/menu_nodes/CCMenuItem.cpp

 void CCMenuItemLabel::setOpacity(GLubyte opacity)

        {

                dynamic_cast(m_pLabel)->setOpacity(opacity);
        }