jQuery 1.9.1 Unable to get property 'createDocumentFragment' of undefined or null reference Line 5823
<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>
