Magento Error: Strict Standards - Only variables should be passed by reference on line 2658

Sometimes when you import your Magento shop to Facebook, you might get the following error:

 

Strict Standards:  Only variables should be passed by reference in /home/.../public_html/lib/Varien/Db/Adapter/Pdo/Mysql.php on line 2658

 

This error is probably related to the eAccelerator module which is used to improve Magento performance.

In case you are using this module, this can be the solution:

 

In the file lib/Varien/Db/Adapter/Pdo/Mysql.php,  on line 2602, please change:

$key = key(array_intersect_key($condition, $conditionKeyMap));

to:

$tmp = array_intersect_key($condition, $conditionKeyMap);

$key = key($tmp);