After I've updated a shop from to I'm not able to get past step 1 of the checkout. Logical explanation would be the form_key issue and I've thoroughly investigated the possibility of this causing the problems. As far as I can see it doesn't, at least not directly... Either with the form_key setting enabled or disable I get the same result: no step 2.

When I look at the console of Firefox I get this message:

Call to undefined method Mage_Checkout_OnepageController::isFormkeyValidationOnCheckoutEnabled () in app/code/core/Mage/Checkout/controllers/OnepageController.php on line 373

The referenced code looks like this:

if ($this->isFormkeyValidationOnCheckoutEnabled() && !$this->_validateFormKey()) {

Obviously if I delete the first part my checkout works again but this can't be solution.

Apparently I'm missing something here. Checkout is not able to verify the form_key setting or something? Anybody who has experience with this kind of issue?

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