Fehlermeldung

Recoverable fatal error: Argument 1 passed to xmlsitemap_node_create_link() must be an instance of stdClass, boolean given, called in /var/www/vhosts/dommuseum-hildesheim.de/httpdocs/sites/all/modules/contrib/xmlsitemap/xmlsitemap_node/xmlsitemap_node.module on line 28 and defined in xmlsitemap_node_create_link() (Zeile 194 von /var/www/vhosts/dommuseum-hildesheim.de/httpdocs/sites/all/modules/contrib/xmlsitemap/xmlsitemap_node/xmlsitemap_node.module).