ShorcutListener handleAction is getting called twice

Hi,

This is regarding the issue i am facing on shortcutlistener. I am using vaadin 7.5.8, i have added a shortcutListener
to a view page. On clicking the shorcut key handleAction() method is getting invoked twice.
Kindly share the ways how to avoid the multiple invocation of method.

Thanks,

Karthikeyan R.