title: Magento | Currency switcher not working when product is already in cart
body: <p>I have a magento store version 1.9.2.3 setup on subdomain. Currency switcher works fine when there is no product in cart. But when i add any product in cart and then apply currency switching i receive following errors</p>
  
  <ul>
  <li>on local i am getting a blank page</li>
  <li>on subdomain i am getting 500 server error</li>
  </ul>
  
  <p>I have already done this in index.php</p>
  
  <pre><code>ini_set("memory_limit", '512M');
  ini_set("max_execution_time", '120');
  </code></pre>
  
  <p>But issue remains same. Please provide any help if possible.</p>