I'm trying to embed an infographic with the HTML block. It renders fine in the EB editor but when i go to publish article, it will not save and i get this error: Unexpected token < in JSON at position 0

Thanks for your help

Here is the code for graphic:
<div class="piktowrapper-embed" pikto-uid="20881940-caption-builder-efficient-adjusting" style="height: 300px; position: relative;"><div class="embed-loading-overlay" style="width: 100%; height: 100%; position: absolute; text-align: center;"><img width="60px" alt="Loading..." style="margin-top: 100px" src="https://magic.piktochart.com/loading.gif"/><p style="margin: 0; padding: 0; font-family: Lato, Helvetica, Arial, sans-serif; font-weight: 600; font-size: 16px">Loading...</p></div><div class="pikto-canvas-wrap"><div class="pikto-canvas"></div></div></div><script>(function(d){var js, id="pikto-embed-js", ref=d.getElementsByTagName("script")[0];if (d.getElementById(id)) { return;}js=d.createElement("script"); js.id=id; js.async=true;js.src="https://magic.piktochart.com/assets/embedding/embed.js";ref.parentNode.insertBefore(js, ref);}(document));</script>