Magento add to cart issue on caching new products

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I’m having problem with add to cart function in new products widget in the homepage. By clicking on “Add to cart” it load /checkout/cart/ page but I receive “The cart is empty!”. I checked for JS problems but I haven’t any error, also in system log. In cache management, if I disable only BLOCK_HTML cache it works fine; if I re-enable it I have the problem

The website is hosted by siteground, actually in cron I have: every 25 min.: php /home/ledsuper/public_html/cron.php > /dev/null every 30 min.: /bin/sh /home/ledsuper/public_html/cron.sh

What is causing the problem? how can I do to try solve? Thx

product magento caching cron
5 Answers
 if (!($formKey = $this->getRequest()->getParam('form_key', null)) || $formKey != Mage::getSingleton('core/session')->getFormKey()) {
                $this->getRequest()->setParams(array('form_key' =>Mage::getSingleton('core/session')->getFormKey()));
     }

You can make the above code as a module It is worked for me. But i did not make it as an module. I directly updated the following file

app/code/core/Mage/Checkout/controllers/CartController.php

There is a function

addAction Paste the above code in beginning thats all.

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