Notice: Undefined variable: the_cat_id in /var/www/web/wp_kpn/wp-content/themes/kpn_timeline/single.php on line 22

Recoverable fatal error: Object of class WP_Error could not be converted to string in /var/www/web/wp_kpn/wp-content/themes/kpn_timeline/single.php on line 22
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