Issues When Overriding the Default User Activation Template in Gravity Forms User Registration Add-On

Overview of the Issue

When visiting the Gravity Forms activation link that is sent to the customer, a fatal error occurs on the site.In example, visiting: http://example.com/?page=gf_activation&key=3f14e4d2e8025d47

For example, the following link: http://example.com/?page=gf_activation&key=3f14e4d2e8025d47

Leads to an error:

PHP Fatal error: __clone method called on non-object in ..wp-contentpluginssitepress-multilingual-cmssitepress.class.php on line 2875

Workaround

In order to fix this, you need to go to ../wp-content/plugins/sitepress-multilingual-cms/sitepress.class.php on line 2875

There, replace the code:

$wp_query = clone $this->wp_query;

With the following:

if(!is_object($this->wp_query)) {
    $this->wp_query = is_object( $wp_query ) ? clone $wp_query : null;
}

All known issues