I'm trying to export products from Magento but when I go to the following location, it just comes with a 500 page error straight away.

System > Import / Export > Dataflow - Profiles

I checked the logs and it has been narrowed down to this:

PHP Fatal error: Class 'Unserialize_Reader_ArrKey' not found in magento/lib/Unserialize/Reader/Arr.php on line 88

How can I fix this? It looks like a patch might not of been applied properly or something.


1 Answer 1


If you are on Magento 1.8 something went wrong ...

Unserialize_Reader_Arr, Unserialize_Reader_ArrKey, Unserialize_XYZ were added in Magento


These files were also part of SUPEE-6788. Please check if the patch was applied correctly.

Download: https://magento.com/tech-resources/download

  • Thanks. Looks like the IT person who setup the website for us must of messed up when patching. Is there no way to fix this? May 16, 2017 at 11:44

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