content-mathml extension throws an error for this expression

This expression

<math xmlns="http://www.w3.org/1998/Math/MathML">
  <apply>
    <plus/>
    <cn> 1 </cn>
    <apply>
      <times/>
      <cn> -444 </cn>
      <ci> x </ci>
    </apply>
  </apply>
</math>

causes the content-mathml to throw an error. It looks like it is line 1321 which should be children[1].textContent = -n;, though the comment does say that this is modifying the original document, so it should probably be rewritten to avoid that.

Also, the ( n = Number(CToP.getTextContent(children[1])) < 0) in the preceding if statement should be ( n = Number(CToP.getTextContent(children[1]))) < 0 (otherwise, n gets the value of boolean rather than the number).