Hi

Try this sir

if(current.u_affected_service.assigned_to.active == true ||current.u_affected_service.assigned_to.active == 'true')
{
gs.eventQueue('wid.notify.ci_owner', current, current.u_affected_service.assigned_to, gs.getUserID());
gs.addInfoMessage(gs.getMessage('The CI owner of this incident will be notified'));
}
else
{
alert('User is not active');
action.setRedirectURL(current);
}