bebeboutik/override/controllers/IdentityController.php

<?php
class IdentityController extends IdentityControllerCore
{
	public function preProcess()
	{
		self::$smarty->assign(array('HOOK_PROFILE_EDIT' => Module::hookExec('profileEdit')));
		
		if (Tools::isSubmit('submitIdentity')) {
		    $customer = new Customer((int)(self::$cookie->id_customer));
    		if (isset($_POST['email'])) {
    		    $_POST['email'] = strtolower(trim($_POST['email']));
    		    if ($_POST['email'] != $customer->email) {
    		        if (Customer::customerExists($_POST['email'])) {
    		            $this->errors[] = Tools::displayError('An account is already registered with this e-mail');
    		        }
    		    }
    		}
		}
		
		parent::preProcess();
	}

	public function setMedia()
	{
		parent::setMedia();

		global $css_files;
		$css_files = array_slice($css_files, 0, 1);
	}
}