title: Fortify dereference null pointer
body: <p>I have the following block of code that fortify is warning about derefrencing a null pointer (Warning occurs at the highlighted section of code).</p>
  
  <p><img src="https://i.stack.imgur.com/XIQoD.png" alt="enter image description here"></p>
  
  <p>Is this a false positive?  It's checking to see if it is null right where the warning is occurring.</p>
  
  <p>Update:
  Added a little more of the code.  We are checking before hand to make sure displayAttribute isn't null.  Could it be because the IsNotNull() is an extension method?</p>
  
  <p><img src="https://i.stack.imgur.com/cP5r8.png" alt="enter image description here"></p>