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Cannot redefine class constant Mage_Customer_Model_Customer::MAXIMUM_PASSWORD_LENGTH in app/code/core/Mage/Customer/Model/Customer.php on line 55

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Note: This is a historical reference, not a current security baseline. Magento 1 is end-of-life.

Problem description

After installing SUPEE-10415 Magento Checkout page is blank/empty. The following error logged in PHP error log or shown (if display_errors is enabled): 
PHP Fatal error: Cannot redefine class constant Mage_Customer_Model_Customer::MAXIMUM_PASSWORD_LENGTH in app/code/core/Mage/Customer/Model/Customer.php on line 55


Cause

app/code/core/Mage/Customer/Model/Customer.php have MAXIMUM_PASSWORD_LENGTH constant declared two or more times. It can happen if the file was patched manually earlier or uploaded from newer Magento version.

Solution

Edit app/code/core/Mage/Customer/Model/Customer.php and delete the extra declaration of MAXIMUM_PASSWORD_LENGTH around line 54: 
--- app/code/core/Mage/Customer/Model/Customer.php
+++ app/code/core/Mage/Customer/Model/Customer.php
@@ -51,15 +51,10 @@
     /**
      * Maximum Password Length
      */
     const MAXIMUM_PASSWORD_LENGTH = 256;
 
-    /**
-     * Maximum Password Length
-     */
-    const MAXIMUM_PASSWORD_LENGTH = 256;
-
     /**#@+
      * Codes of exceptions related to customer model
      */
     const EXCEPTION_EMAIL_NOT_CONFIRMED       = 1;
     const EXCEPTION_INVALID_EMAIL_OR_PASSWORD = 2;


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