title: NSNull isEqualToString Issue With JSON Response
body: <p>I am getting the following error</p>
  
  <pre><code>-[NSNull isEqualToString:]: unrecognized selector sent to instance 0x3c168090
  </code></pre>
  
  <p>on this line of code</p>
  
  <pre><code>cell.offerTitle.text = [voucherData objectForKey:@"offer_title"];
  </code></pre>
  
  <p>Could someone help me correct the problem please?</p>
  
  <p>Thanks
  Oliver</p>