title: TYPO3 JavaScript error in template editor
body: <p>With the following typoscript code I'm getting a javascript error in <code>Typo3 9.5.1</code>:</p>
  
  <pre><code>page.headerData.20 = TEXT
  page.headerData.20.value (
  &lt;script&gt;
    (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
    (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
    m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
    })(window,document,'script','//www.google-analytics.com/analytics.js','ga');
  
    ga('create', 'UA-xxx', 'xxxx');
    ga('send', 'pageview');
  
  &lt;/script&gt;
  )
  </code></pre>
  
  <blockquote>
    <p>TypeError: cc[(cc.length - 1)] is null[Weitere Informationen]
    typoscript.js:1194:18</p>
  </blockquote>
  
  <p>Whats the error?</p>