title: jQuery 1.9.1 Unable to get property 'createDocumentFragment' of undefined or null reference Line 5823
body: <p>Recently I updated my ASP.Net MVC4 project to upgrade to jQuery 1.9.1. But since then I am getting a strange error as soon as any page is loaded:</p>
  
  <p>(Chrome) jquery-1.9.1.js:5823 Uncaught TypeError: Cannot call method 'createDocumentFragment' of null</p>
  
  <p>(IE10) Unable to get property 'createDocumentFragment' of undefined or null reference 
  jquery-1.9.1.js, line 5823 character 3</p>
  
  <p>The 'document' parameter being passed to its parent function createSafeFragment( document ) is always null. The error is persistent in IE10 as well as Chrome. Below is how scripts are included in the layout:</p>
  
  <pre><code>&lt;script src="/Scripts/jquery-1.9.1.js"&gt;&lt;/script&gt;
  &lt;script src="/Scripts/jquery-ui-1.10.2.js"&gt;&lt;/script&gt;
  &lt;script src="/Scripts/jquery.unobtrusive-ajax.js"&gt;&lt;/script&gt;
  &lt;script src="/Scripts/jquery.validate.js"&gt;&lt;/script&gt;
  &lt;script src="/Scripts/jquery.validate.unobtrusive.js"&gt;&lt;/script&gt;
  &lt;script src="/Scripts/bootstrap.js"&gt;&lt;/script&gt;
  </code></pre>
  
  <p>I tried to trace the error by debugging the scripts but could not find the exact source.</p>
  
  <p>Has anybody come across this with any breakthrough? Any help is appreciated.</p>
  
  <hr>
  
  <p>UPDATE</p>
  
  <hr>
  
  <p>jQuery Tooltip was conflicting with Bootstrap Tooltip.
  Changed the functionality to use Bootstrap and the error has gone.</p>