title: Fatal error: Cannot use assign-op operators with overloaded objects nor string offsets
body: <p>I am getting following error</p>
  
  <pre><code>Fatal error: Cannot use assign-op operators with overloaded objects nor string offsets in app/code/core/Mage/Adminhtml/Block/Widget/Grid/Column/Filter/Price.php on line 126
  </code></pre>
  
  <p>On my server when try to filter product in product grid.</p>
  
  <p>I am not changed any core files at all, but it showing the core file line 126.</p>
  
  <p>I googled for this issue, no proper result.
  <strong>Is there anybody who got this problem and solved it.?</strong></p>
  
  <p><strong>I am not sure but is this a PHP Version problem?</strong>
  Because same application working fine on localhost, In my local machine I have PHP 5.5.18 and in server its 5.3.</p>
  
  <p>Thanks in advance :)</p>