JS Webhook Causes Error During Survey

I am using a webhook in the JavaScript of one of my survey questions to export some survey data to Zapier (an automation engine).

I am able to successfully send data out with the webhook, however, it then breaks the survey and I get the error “#B.1ykou2s.lnlu16va” shown below when I try to move on to the next question.

Any thoughts on what could be the solution?

Error after clicking “next” button to go to next survey question:

My JavaScript code for the webhook is here: 

Qualtrics.SurveyEngine.addOnload(function()
{
	/*Place your JavaScript here to run when the page loads*/

      var request = new XMLHttpRequest();
      request.open("POST", "https://hooks.zapier.com/hooks/catch/xxxxxxx/xxxxxxx/", true);


      var params = {
        q_response_id: "${e://Field/ResponseID}",
        email: "${q://QID19/ChoiceTextEntryValue/4}",
        content: "example content",
      }

      request.send(JSON.stringify(params));

});

Thanks.