Fatal error: Cannot use object of type WP_Error as array

  • Dear all,
    I have just activated this plugin, but it doesn’t run.
    I inserted an hashtag in an article, but when I launch the preview the website reports this error:

    Fatal error: Cannot use object of type WP_Error as array in /web/htdocs/www.mysite.it/home/wp-content/plugins/hashtagger/inc/class-hashtagger.php on line 597

    I have an old WordPress release (4.4.22) and I cannot update that for some reasons now.
    The plugin searcher reported this plugin as compatible with my WordPress version.

    Could it be due to my PHP version? I use PHP 5.5.38.

    Regards.

    The page I need help with: [log in to see the link]

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