Not an ARRAY reference

I am reading an XML file in perl and looping through the items and
manipulating data. If I have 2 or more 'menuitems' in my xml file it
works ok. if i only have one like the code below I get "Not an ARRAY
reference" at the foreach line - any ideas why?

$create_menu = new XML::Simple (KeyAttr=>[]);

$data = $create_menu->XMLin($xml_file);

foreach $e (@{$data->{menuitem}}){
......
}


xml is
<?xml version='1.0'?>
<menu>
<menuitem>
<node>1</node>
<parent>1</parent>
<sibling>1</sibling>
<submenu>0</submenu>
<subsubmenu>0</subsubmenu>
<label>ramooooooooooon</label>
<link>topic1.xml</link>
</menuitem>
</menu>

.

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