title: What could cause a undefinedpageWebRequestEvents.js appearing in my logs?
body: <p>We're seeing this extremely rare, extremely odd bug in our logs.  When some people (I believe most are on Safari) are trying to access various pages on our site, they get an error and can't proceed.  When I check the logs, I see URLs with <code>undefinedpageWebRequestEvents.js</code> in them.  </p>
  
  <p>I've searched around but can't seem to find any explanation of what this might be or what might be causing them.  There is VERY little javascript on this site, and hundreds of thousands of others are not seeing this error (including us - we cannot duplicate) so any advice is appreciated.</p>