In some cases, the user_id is not tracked

Support & Bugs
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1

I use this code to track activities on my website:

<!-- Matomo -->
<script type="text/javascript">
  var _paq = window._paq = window._paq || [];
  _paq.push(['setUserId', 'USER_ID_HERE']);
  _paq.push(['trackPageView']);
  _paq.push(['enableLinkTracking']);
  (function() {
    var u="//{$MATOMO_URL}/";
    _paq.push(['setTrackerUrl', u+'matomo.php']);
    _paq.push(['setSiteId', {$IDSITE}]);
    var d=document, g=d.createElement('script'), s=d.getElementsByTagName('script')[0];
    g.type='text/javascript'; g.async=true; g.src=u+'matomo.js'; s.parentNode.insertBefore(g,s);
  })();
</script>
<!-- End Matomo Code -->

However, in 200 out of 42,000 cases, the user_id is not tracked, but all other information is tracked.
It is impossible to log in to the page without authorization and the user_id must be tracked.
Help me :slight_smile: