https://sourceforge.net/tracker/?func=detail&aid=2992276&group_id=152762&atid=785194

Hi,
I think SelectListitemConverter should handle null values, too, forum http://www.zkoss.org/forum/listComment/12132

Probably related to the feature request 2974368, https://sourceforge.net/tracker/?func=detail&aid=2974368&group_id=152762&atid=785194

Example:
<?init class="org.zkoss.zkplus.databind.AnnotateDataBinderInit" ?>
<window id="win">
<zscript><![CDATA[
List list1 = new ArrayList();
list1.add("A");
list1.add("B");
list1.add("C");
list1.add(null);
]]></zscript>
List1
<listbox id="listbox1" mold="select" rows="1" model="@

{list1}

" selectedItem="@

{selected1}

">
<listitem self="@

{each=listEach}

" label="@

{listEach}

" />
</listbox>

]]></zscript>
</window>

Should select the fourth item.