title: PHP unserialize(): Error at offset
body: <p>I have a problem with Drupal 6.20.</p>
  
  <p>Possibly after a PHP update, site stopped working. I get:</p>
  
  <pre><code>Notice: unserialize() [function.unserialize]: Error at offset 0 of 22765 bytes in /PATH/includes/cache.inc on line 33
  </code></pre>
  
  <p>This is the line:</p>
  
  <pre><code>$cache-&gt;data = unserialize($cache-&gt;data);
  </code></pre>
  
  <p>I would appreciate any help.</p>