Disable Mage_Reports module

config.xml

<config>
  <frontend>
    <catalog_product_compare_remove_product>
        <observers>
            <reports>
                <type>disabled</type>
            </reports>
        </observers>
    </catalog_product_compare_remove_product>
    <customer_login>
        <observers>
            <reports>
                <type>disabled</type>
            </reports>
        </observers>
    </customer_login>
    <customer_logout>
        <observers>
            <reports>
                <type>disabled</type>
            </reports>
        </observers>
    </customer_logout>
    <catalog_controller_product_view>
        <observers>
            <reports>
                <type>disabled</type>
            </reports>
        </observers>
    </catalog_controller_product_view>
    <sendfriend_product>
        <observers>
            <reports>
                <type>disabled</type>
            </reports>
        </observers>
    </sendfriend_product>
    <catalog_product_compare_add_product>
        <observers>
            <reports>
                <type>disabled</type>
            </reports>
        </observers>
    </catalog_product_compare_add_product>
    <catalog_product_compare_item_collection_clear>
        <observers>
            <reports>
                <type>disabled</type>
            </reports>
        </observers>
    </catalog_product_compare_item_collection_clear>
    <sales_quote_item_save_before>
        <observers>
            <reports>
                <type>disabled</type>
            </reports>
        </observers>
    </sales_quote_item_save_before>
    <wishlist_add_product>
        <observers>
            <reports>
                <type>disabled</type>
            </reports>
        </observers>
    </wishlist_add_product>
    <wishlist_share>
        <observers>
            <reports>
                <type>disabled</type>
            </reports>
        </observers>
    </wishlist_share>
  </frontend>
</config>

<events> tag is missed:

<config>
<frontend>
<events>
...
</events>
</frontend>
</config>