Prompt Title: DOM Error in Sovendus Integration.

The error message "Uncaught TypeError: can't access property 'appendChild', t is null" is typically caused when trying to access or manipulate an element that doesn't exist or is not yet available in the DOM.

From the code you provided, it seems like the error could be coming from the flexibleIframe.js script file that you are loading asynchronously. To confirm this, you should check the developer console in your browser to see where the error originates from. If it is indeed in the flexibleIframe.js file, there might be an issue with the script trying to access an element before it is available in the DOM.

To potentially fix this issue, try to load the flexibleIframe.js script after the DOM content is loaded. You can achieve this by adding an event listener for the DOMContentLoaded event, like this:

htmlCopy code
<div id="sovendus-container-1"></div>
<script type="text/javascript">
  window.sovIframes = window.sovIframes || [];
  window.sovIframes.push({
    trafficSourceNumber: '6067',
    trafficMediumNumber: '56492',
    sessionId: 'string',
    timestamp: 'string',
    orderId: 'string',
    orderValue: 'string',
    orderCurrency: 'string',
    usedCouponCode: 'string',
    iframeContainerId: 'sovendus-container-1',
  });
  window.sovConsumer = window.sovConsumer || {};
  window.sovConsumer = {
    consumerSalutation: '',
    consumerFirstName: 'string',
    consumerLastName: 'string',
    consumerEmail: 'string',
  };
  var sovDomain = window.location.protocol + '//' + 'api.sovendus.com';
  var sovJsFile = sovDomain + '/sovabo/common/js/flexibleIframe.js';

  function loadScript(src, callback) {
    var script = document.createElement('script');
    script.type = 'text/javascript';
    script.async = true;
    script.src = src;
    script.onload = callback;
    document.head.appendChild(script);
  }

  document.addEventListener('DOMContentLoaded', function () {
    loadScript(sovJsFile);
  });
</script>

In the code above, I replaced the document.write() method with a loadScript() function that creates and appends the script element to the document head. This way, the flexibleIframe.js script is loaded after the DOM content is loaded, which should help avoid the error you are experiencing.

If this doesn't resolve the issue, you might need to review the flexibleIframe.js script to see if there is any problem with the way it's handling the DOM.