Uncaught Error: Call to a member function cloneNode() on null in /home/devadm/public_html/blogs/wp-content/plugins/fb-instant-articles/vendor/facebook/facebook-instant-articles-sdk-php/src/Facebook/InstantArticles/Transformer/Transformer.php on line 105

• cloneNode()
  wp-content/plugins/fb-instant-articles/vendor/facebook/facebook-instant-articles-sdk-php/src/Facebook/InstantArticles/Transformer/Getters/MultipleElementsGetter.php:34
• get()
  wp-content/plugins/fb-instant-articles/vendor/facebook/facebook-instant-articles-sdk-php/src/Facebook/InstantArticles/Transformer/Rules/ConfigurationSelectorRule.php:160
• getProperty()
  wp-content/plugins/fb-instant-articles/vendor/facebook/facebook-instant-articles-sdk-php/src/Facebook/InstantArticles/Transformer/Rules/InteractiveRule.php:82
• apply()
  wp-content/plugins/fb-instant-articles/vendor/facebook/facebook-instant-articles-sdk-php/src/Facebook/InstantArticles/Transformer/Transformer.php:338
• transform()
  wp-content/plugins/fb-instant-articles/vendor/facebook/facebook-instant-articles-sdk-php/src/Facebook/InstantArticles/Transformer/Rules/PassThroughRule.php:32
• apply()
  wp-content/plugins/fb-instant-articles/vendor/facebook/facebook-instant-articles-sdk-php/src/Facebook/InstantArticles/Transformer/Transformer.php:338
• transform()
  wp-content/plugins/fb-instant-articles/vendor/facebook/facebook-instant-articles-sdk-php/src/Facebook/InstantArticles/Transformer/Rules/PassThroughRule.php:32
• apply()
  wp-content/plugins/fb-instant-articles/vendor/facebook/facebook-instant-articles-sdk-php/src/Facebook/InstantArticles/Transformer/Transformer.php:338
• transform()
  wp-content/plugins/fb-instant-articles/vendor/facebook/facebook-instant-articles-sdk-php/src/Facebook/InstantArticles/Transformer/Transformer.php:265
• transformString()
  wp-content/plugins/fb-instant-articles/class-instant-articles-post.php:686
• to_instant_article()
  wp-content/plugins/fb-instant-articles/class-instant-articles-post.php:873
• is_empty_after_transformation()
  wp-content/plugins/fb-instant-articles/class-instant-articles-post.php:950
• should_submit_post()
  wp-content/plugins/fb-instant-articles/facebook-instant-articles.php:352
• inject_ia_markup_meta_tag()
  wp-includes/class-wp-hook.php:287
• apply_filters()
  wp-includes/class-wp-hook.php:311
• do_action()
  wp-includes/plugin.php:478
• do_action()
  wp-includes/general-template.php:2884
• wp_head()
  wp-content/themes/opovotheme/header.php:18
• require_once()
  wp-includes/template.php:723
• load_template()
  wp-includes/template.php:672
• locate_template()
  wp-includes/general-template.php:41
• get_header()
  wp-content/themes/opovotheme/desktop/category.php:1
• require()
  wp-includes/template.php:725
• load_template()
  wp-includes/template.php:672
• locate_template()
  wp-includes/general-template.php:168
• get_template_part()
  wp-content/themes/opovotheme/category.php:7
• include()
  wp-includes/template-loader.php:106
• require_once()
  wp-blog-header.php:19
• require()
  index.php:17