error_message_on closes parent tag

I have the following simple form:

<% form_for(form, :url => root_path) do |f| %>
<p>
  <%= f.label :name %>
  <%= f.error_message_on :name %>
  <%= f.text_field :name %>
</p>
...

Each label/input is enclosed in a paragraph tag. When this is initially rendered, I see the expected HTML:

<form action="/" class="new_user_invite" id="new_user_invite" method="post">
<!-- auth token.... -->
<p>
  <label for="user_invite_name">Name</label>
  
  <input id="user_invite_name" name="user_invite[name]" size="30" type="text">
</p>
...

However, if there is an error on this field, I end up with the following HTML:

<form action="/" class="new_user_invite" id="new_user_invite" method="post">
<!-- auth token ... -->
<p>
  </p><div class="fieldWithErrors"><label for="user_invite_name">Name</label></div>
  <div class="formError">can't be blank</div>
  <div class="fieldWithErrors"><input id="user_invite_name" name="user_invite[name]" size="30" value="" type="text"></div>
...

As you can see, the validation error on this field causes the

tag to be closed before the label & input HTML is generated. This obviously is not what is expected here.

I'm using rails 2.3.5, rack 1.0.1 and rake 0.8.7.