getBBox() returns null

I have svg as shown below. Whenever I load this svg and try to get BBox of
its text it returns null. How to properly get the BBox?

Element eltText = document.getElementById("id3");
SVGRect svgRect = ((SVGOMTextElement)eltText).getBBox(); <-- returns null


<svg
   xmlns="http://www.w3.org/2000/svg"
   version="1.1"
   id="id">
  <g
     id="id1"
     transform="matrix(1,0,0,1,0,0)">
    <rect
       id="id2"
       width="10"
       height="10"
       fill="none"
       stroke="#ffffff"/>
    <text
       id="id3"
       x="10"
       y="10"
       font-style="normal"
       text-decoration="none"
       font-weight="normal"
       font-size="12"
       font-family="none"
       fill="red">
       text</text>
  </g>
</svg>



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