Fatal error: Uncaught Error: Call to a member function cloneNode() on null in /var/www/html/wp-content/plugins/fb-instant-articles/vendor/facebook/facebook-instant-articles-sdk-php/src/Facebook/InstantArticles/Transformer/Transformer.php:105 Stack trace: #0 /var/www/html/wp-content/plugins/fb-instant-articles/vendor/facebook/facebook-instant-articles-sdk-php/src/Facebook/InstantArticles/Transformer/Getters/MultipleElementsGetter.php(34): Facebook\InstantArticles\Transformer\Transformer::cloneNode(NULL) #1 /var/www/html/wp-content/plugins/fb-instant-articles/vendor/facebook/facebook-instant-articles-sdk-php/src/Facebook/InstantArticles/Transformer/Rules/ConfigurationSelectorRule.php(160): Facebook\InstantArticles\Transformer\Getters\MultipleElementsGetter->get(Object(DOMElement)) #2 /var/www/html/wp-content/plugins/fb-instant-articles/vendor/facebook/facebook-instant-articles-sdk-php/src/Facebook/InstantArticles/Transformer/Rules/InteractiveRule.php(82): Facebook\InstantArticles\Transformer\Rules\ConfigurationSelectorRule- in /var/www/html/wp-content/plugins/fb-instant-articles/vendor/facebook/facebook-instant-articles-sdk-php/src/Facebook/InstantArticles/Transformer/Transformer.php on line 105