title: JavaScript error in Browser-Link
body: <p>I am working on a project that a former colleague has made. If I run this ASP MVC 4 application in Firefox everything works fine but, when I run it on Internet Explorer 9 I get this weird error: </p>
  
  <blockquote>
    <p><img src="https://i.stack.imgur.com/LGGmj.jpg" alt="image"></p>
  </blockquote>
  
  <p>It says there is a error in the SignalR JavaScript Library but I never heard of this. It breaks into a JS file that is not even in the solution.</p>
  
  <p>This SignalR extension is not installed.</p>
  
  <p><strong>All the references in my views:</strong></p>
  
  <pre><code>&lt;script type="text/javascript" src="~/Scripts/jquery-1.7.1.min.js"&gt;&lt;/script&gt;
  &lt;script type="text/javascript" src="~/Scripts/perso.js"&gt;&lt;/script&gt;
  &lt;script src="../../Scripts/jquery-1.7.1.js" type="text/javascript"&gt;&lt;/script&gt;
  </code></pre>
  
  <p><strong>UPDATE</strong></p>
  
  <p>I have found the problem, in my console log it breaks on this error:</p>
  
  <blockquote>
    <p>TypeError: a[0] is undefined @ browserLink:37</p>
  </blockquote>
  
  <p>This occurs in my jQuery files. I have updated them with the newest version but no success.</p>
  
  <p>I have no idea how to fix this, any ideas? </p>