500 Internal Server Error

Technical details:
Error: access to uninitialised variable - item
***  in function &quot;(Unknown)&quot;
***  line: return (boolstr(item))

evaluating argument for _ixif_  around

&lt;%= boolstr(item) %&gt;&gt;
        &lt;%
        local obj_title = html_encode(CURRENT_NODE.&quot;title&quot;)
        %&gt;
        &lt;h1&gt;&lt;%= obj_title %&gt;&lt;/h1&gt;

        &lt;_ixif_ &lt;%= boolstr(array_length(item_data)) %&gt;&gt;