AAC fails w3 validation

I get validation errors from http://validator.w3.org that look like this:

Line 1383, Column 43: value of attribute "id" invalid: "7" cannot start a name .
<input type="hidden" name="uc_aac_nid" id="7_uc_aac_nid" value="7"  />
It is possible that you violated the naming convention for this attribute. For example, id and name attributes must begin with a letter, not a digit.

when validating a catalog grid view with attributes showing.

I think it gets generated in uc_aac_form_alter on line 58: '#id' => $form['nid']['#value'] .'_uc_aac_nid'