doc reporter seems to hang and never finish

[dalanmiller]

When running just the normal spec test, my tests will finish as such:

./node_modules/mocha-phantomjs/bin/mocha-phantomjs -R spec --ignore-resource-errors test/test-es5.html

However, when I do the same with -R doc, I get this output:

$ ./node_modules/mocha-phantomjs/bin/mocha-phantomjs -f output.txt -R doc --ignore-resource-errors test/test-es5.html

   <section class="suite">
      <h1>Object API</h1>
      <dl>
        <section class="suite">
          <h1>Object</h1>
          <dl>
            <dt>...description...</dt>
            <dd><pre><code>
...code omitted...
</code></pre></dd>
            <dt class="error">...error message...</dt>

Where it will just sit until I kill the process? Is there some other setting I need to set?