Error after disabling modules

I've disabled the Rss and Newsletter modules of my Magento 1.7 instance following the instructions of this post:

http://inchoo.net/ecommerce/magento/how-to-fully-disable-turn-off-magento-module/comment-page-1/#comment-65853

I just edited the appetcmodulesMage_All.xml file by changing to <active>false</active> in both Mage_Rss and Mage_Newsletter modules.

The problem is that when I try to load a customer page through admin panel, I get the following error:

Fatal error: Call to a member function loadByCustomer() on a non-object in appcodecoreMageNewsletterModelSubscriber.php on line 267

Why is it happening? Why is this code being executing even though I've disabled such module?

Thanks!

---

First step after disabling a module through its <active> entry. Always clear cache and if you use the compiler, recompile so you don't have code referencing classes in the disabled module.

Often the problem is not with code executing after the module is shut off through the app/etc/modules/mod_name.xml by setting <active> to false, but with other modules, templates or layouts attempting to call code in the disabled module.

Where issues come in are if another module lists the module just turned off in its dependency list . Always check all the other module xml files dependency lists for mention of the module you are deactivating.

Also, you have to check for template .phtml files that reference classes in the disabled module. This can throw the dreaded call to a non-object type exception errors. As an example, one module that provides custom cart attributes asks you to add entries to your cart templates. Shutting off the module does not get rid of the references.

Make sure no layouts are attempting to load anything referencing this module as well (custom layout local.xml).

You also might want to go to System Config, Advanced and shut the Newsletter module output off there in case the Magento Customer Account is depending on testing for the module being disabled by calling that entry instead of actually checking to see if the Module is loaded. Sometimes Magento programmers forget to do proper error trapping, which has thrown me for a loop before.

---

I believe I could solve the problem (not sure if generated any side effect):

Just edited the file appcodecoreMageAdminhtmlBlockCustomerEditTabs.php around line 90 by adding the external if clause:

        if (Mage::helper('core')->isModuleEnabled('Mage_Newsletter')) {
            if (Mage::getSingleton('admin/session')->isAllowed('newsletter/subscriber')) {
                        $this->addTab('newsletter', array(
                            'label'     => Mage::helper('customer')->__('Newsletter'),
                            'content'   => $this->getLayout()->createBlock('adminhtml/customer_edit_tab_newsletter')->initForm()->toHtml()
                        ));
                    }
        }

+1 if I saved your day and please let me know if you noticed and possible impact :D

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