title: Illegal access Javascript error in Chrome
body: <p>I have sporadically been getting an "illegal access" exception in Chrome (29 and 30). Others have also seen this. It seems to happen on one specific line:</p>
  
  <p><img src="https://i.stack.imgur.com/IZZbS.png" alt="enter image description here]![enter image description here"></p>
  
  <p>Here, <code>this</code> is an object I defined. It has a property <code>end</code> which is <code>null</code> or a number.</p>
  
  <p>Does anyone know of anything that could cause an error <em>with that message</em> in Chrome?</p>
  
  <p>EDIT: I don't expect anyone to debug ten thousands of lines of my code. What could cause an error with <em>that message</em>, whether it be jumping off the moon, singing blues, etc?</p>
  
  <p>There are no occurrences of "illegal" in all of the Javascript code on the page.</p>
  
  <hr>
  
  <p>This error has not happened in later versions of Chrome (31+).</p>
  
  <p>Hopefully this is gone for good.</p>