stackblitz-labs / stackblitz-labs/pkg.pr.new

"Worker threw an exception"

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Dominant language
TypeScript
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Description

Hi!

Today I have seen this error coming up multiple times when publishing previews from the Babel repo:

<!DOCTYPE html>
<!--[if lt IE 7]> <html class="no-js ie6 oldie" lang="en-US"> <![endif]-->
<!--[if IE 7]>    <html class="no-js ie7 oldie" lang="en-US"> <![endif]-->
<!--[if IE 8]>    <html class="no-js ie8 oldie" lang="en-US"> <![endif]-->
<!--[if gt IE 8]><!--> <html class="no-js" lang="en-US"> <!--<![endif]-->
<head>
<title>Worker threw exception | pkg.pr.new | Cloudflare</title>
<meta charset="UTF-8" />
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=Edge" />
<meta name="robots" content="noindex, nofollow" />
<meta name="viewport" content="width=device-width,initial-scale=1" />
<link rel="stylesheet" id="cf_styles-css" href="/cdn-cgi/styles/cf.errors.css" />
<!--[if lt IE 9]><link rel="stylesheet" id='cf_styles-ie-css' href="/cdn-cgi/styles/cf.errors.ie.css" /><![endif]-->
<style>body{margin:0;padding:0}</style>


<!--[if gte IE 10]><!-->
<script>
  if (!navigator.cookieEnabled) {
    window.addEventListener('DOMContentLoaded', function () {
      var cookieEl = document.getElementById('cookie-alert');
      cookieEl.style.display = 'block';
    })
  }
</script>
<!--<![endif]-->

</head>
<body>
    <div id="cf-wrapper">
        <div class="cf-alert cf-alert-error cf-cookie-error" id="cookie-alert" data-translate="enable_cookies">Please enable cookies.</div>
        <div id="cf-error-details" class="cf-error-details-wrapper">
            <div class="cf-wrapper cf-header cf-error-overview">
                <h1>
                    <span class="cf-error-type" data-translate="error">Error</span>
                    <span class="cf-error-code">1101</span>
                    <small class="heading-ray-id">Ray ID: 9b06e6eed86788fa &bull; 2025-12-19 12:28:50 UTC</small>
                </h1>
                <h2 class="cf-subheadline" data-translate="error_desc">Worker threw exception</h2>
            </div><!-- /.header -->
    
            <section></section><!-- spacer -->
    
            <div class="cf-section cf-wrapper">
                <div class="cf-columns two">
                    <div class="cf-column">
                        <h2 data-translate="what_happened">What happened?</h2>
                            <p>You've requested a page on a website (pkg.pr.new) that is on the <a href="https://www.cloudflare.com/5xx-error-landing?utm_source=error_100x" target="_blank">Cloudflare</a> network. An unknown error occurred while rendering the page.</p>
                    </div>
                    
                    <div class="cf-column">
                        <h2 data-translate="what_can_i_do">What can I do?</h2>
                            <p><strong>If you are the owner of this website:</strong><br />refer to <a href="https://developers.cloudflare.com/workers/observability/errors/" target="_blank">Workers - Errors and Exceptions</a> and check Workers Logs for pkg.pr.new.</p>
                    </div>
                    
                </div>
            </div><!-- /.section -->
    
            <div class="cf-error-footer cf-wrapper w-240 lg:w-full py-10 sm:py-4 sm:px-8 mx-auto text-center sm:text-left border-solid border-0 border-t border-gray-300">
    <p class="text-13">
      <span class="cf-footer-item sm:block sm:mb-1">Cloudflare Ray ID: <strong class="font-semibold">9b06e6eed86788fa</strong></span>
      <span class="cf-footer-separator sm:hidden">&bull;</span>
      <span id="cf-footer-item-ip" class="cf-footer-item hidden sm:block sm:mb-1">
        Your IP:
        <button type="button" id="cf-footer-ip-reveal" class="cf-footer-ip-reveal-btn">Click to reveal</button>
        <span class="hidden" id="cf-footer-ip">40.65.58.132</span>
        <span class="cf-footer-separator sm:hidden">&bull;</span>
      </span>
      <span class="cf-footer-item sm:block sm:mb-1"><span>Performance &amp; security by</span> <a rel="noopener noreferrer" href="https://www.cloudflare.com/5xx-error-landing" id="brand_link" target="_blank">Cloudflare</a></span>
      
    </p>
    <script>(function(){function d(){var b=a.getElementById("cf-footer-item-ip"),c=a.getElementById("cf-footer-ip-reveal");b&&"classList"in b&&(b.classList.remove("hidden"),c.addEventListener("click",function(){c.classList.add("hidden");a.getElementById("cf-footer-ip").classList.remove("hidden")}))}var a=document;document.addEventListener&&a.addEventListener("DOMContentLoaded",d)})();</script>
  </div><!-- /.error-footer -->

        </div><!-- /#cf-error-details -->
    </div><!-- /#cf-wrapper -->

     <script>
    window._cf_translation = {};
    
    
  </script> 
</body>
</html>

Contributor guide

No contributing guide indexed for this repository

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reproducing the failure when publishing Babel previews through pkg.pr.new, then inspect the Cloudflare Workers logs for error 1101 and the reported Ray ID. Trace the worker exception to its source and confirm that Babel preview publishing completes successfully without the Cloudflare error.

Written by the indexing model from the issue text.

Assessment

Tech stack
typescript
Domain
cloud, infrastructure
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
25/100

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