title: OpenCart 2.0.0. - SyntaxError: JSON.parse: unexpected end of data at line 1 column 1 of the JSON data OK
body: <p>In OpenCart v. 2.0.0 in /admin when I receive an order I should be able to change status of the order to let the customer know what is going on with her purchase. This functionality is in 'History' tab.
  Unfortunately I can't change or modify any orders.
  When I change the status and try to save it Openart gives me an error:</p>
  
  <pre><code>SyntaxError: JSON.parse: unexpected end of data at line 1 column 1 of the JSON data OK
  </code></pre>
  
  <p>It happens even on clean install. Everything is set up correctly - the domain name is OK, the shop is not in maintenance mode, there is no password in .htaccess file (BTW even removing it doesn't help).</p>
  
  <p>It looks like in the screenshot attached.<img src="https://i.stack.imgur.com/NjgUq.jpg" alt="enter image description here"></p>
  
  <p>The one solution is to install the newest version of OpenCart which is in the moment I'm writing this post 2.0.1.1. It's probably the best idea. </p>
  
  <p>My problem is that I have made quite a lot of modifications and that would be very difficult for me. Making my changes I didn't use vqmod which probably I should use (but nobody is perfect - isn't she?). 
  Or maybe you don't want to go into upgrade for a different reason?</p>
  
  <p>Now, how to resolve this problem without actually changing the software itself?</p>