If you get this error:


Fatal error: Call to a member function extend() on a non-object in /public_html/app/code/core/Mage/Core/Model/Mysql4/Config.php on line 115


After MySQL dump import in a Magento database, most likely Magento MySQL tables had wrong values in some fields.

This happens when default auto_value_for_zero option is activated in MySql.

To fix the error add these commands in the beginning of a MySQL dump you want to import:


[cc lang='sql' ]


Most likely it will fix the Magento fatal error.

If the database is already imported, you can fix the issue using these MySQL commands:


[cc lang='sql' ]
UPDATE 'core_website' SET 'website_id' = 0 WHERE 'code' like 'admin';
UPDATE 'core_store' SET 'store_id' = 0 WHERE 'code' like 'admin';
UPDATE 'customer_group' SET 'customer_group_id' = 0 WHERE 'customer_group_code' like 'NOT LOGGED IN';


These commands will reset the website_id, store_id and customer_group_id values to zero for admin user and 'not logged in' user type.