- 
    Type:Bug 
- 
    Resolution: Fixed
- 
    Priority:Normal 
- 
    Affects Version/s: Freshly, 9.5.0, 9.6.0
- 
    Component/s: Components
- 
    Security Level: Jimmy
- 
        None
Steps to Reproduce
run the example
<zk>
    <navbar collapsed="true" orient="vertical" width="50px">
        <nav iconSclass="z-icon-user" label="Users">
            <navitem label="test 1"/>
            <navitem label="test 2"/>
            <navitem label="test 3"/>
        </nav>
        <nav iconSclass="z-icon-car" label="Cars"/>
    </navbar>
</zk>
mouse hover the "Cars" menu as shown in the screenshot below
  
 
Current Result
JS Errors appear in the console
za11y.wpd:4588 Uncaught TypeError: Cannot read property 'nextSibling' of undefined
    at Object.findFirstVisibleChild (za11y.wpd:4588)
    at init._setAriaExpanded (za11y.wpd:4722)
    at init._openPopup (za11y.wpd:4738)
    at init._doMouseEnter (zkmax.nav.wpd:224)
    at HTMLAnchorElement.<anonymous> (zk.wpd:20503)
    at HTMLAnchorElement.handle (zk.wpd:6094)
    at HTMLAnchorElement.dispatch (zk.wpd:5614)
    at HTMLAnchorElement.elemData.handle (zk.wpd:5418)
findFirstVisibleChild	@	za11y.wpd:4588
_setAriaExpanded	@	za11y.wpd:4722
_openPopup	@	za11y.wpd:4738
_doMouseEnter	@	zkmax.nav.wpd:224
(anonymous)	@	zk.wpd:20503
handle	@	zk.wpd:6094
dispatch	@	zk.wpd:5614
elemData.handle	@	zk.wpd:5418
Expected Result
no errors

