Whenver I turn on FPC(Full Page Cache) feature in my Magento CE 2.0.2 site (doesn't matter if default theme or custom theme is running.) and when I open the Homepage of this site, then it gives "Internal Server Error 500" in the Firefox console, and the page is blank.

What could be the possible issue ?

  • Try enabling developer mode to see what the error is (also look in your web server's error log). Commented Mar 7, 2016 at 18:32
  • Have you found a solution? we have the same problem on 2.0.6
    – Max
    Commented Aug 22, 2016 at 11:40
  • Same problem for us on 2.1.1, PHP 5.6 FPM, Nginx. Enabling developer mode doesn't provide any additional information. The PHP error we're getting is PHP Fatal error: Call to a member function getIdentities() on null in /vendor/magento/module-catalog/Block/Product/View.php on line 373 The problem is in the function getIdentities() on the line: $identities = $this->getProduct()->getIdentities(); $this->getProduct() is null when Full Page Cache is enabled. Commented Sep 15, 2016 at 14:36

2 Answers 2


We had the same issue after enabling FPC. The following error would occur:

Fatal error: Uncaught Error: Call to a member function getIdentities() on null in /vendor/magento/module-catalog/Block/Category/View.php:177 

Not the most helpful error message but after some digging we found that this was being triggered by using the block type Magento\Catalog\Block\Category\View on our homepage - presumably because there is no category initialised at that point.

This was a coding error by one of our developers as this particular block did not need that type and was fine with just Magento\Framework\View\Element\Template which is the Magento 2 equivalent of core/template.


rewrite the function like this to handle the null values:

public function getIdentities()
        $identities = [];

        if (is_array($this->getItems()) || is_object($this->getItems()))
            foreach ($this->getItems() as $item)
                $identities = array_merge($identities, $item->getIdentities());
        return $identities;


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