Culture in Groningen

Fatal error:
Trying to get property of non-object in /home/46538-52741.cloudwaysapps.com/wumsvgjhcs/public_html/wp-content/themes/LAB050/content-cat-select.php on line 4
Stack trace:
ErrorException: Trying to get property of non-object in /home/46538-52741.cloudwaysapps.com/wumsvgjhcs/public_html/wp-content/themes/LAB050/content-cat-select.php on line 4
 at errHandle(errorHandling.php:10)
 at require(content-cat-select.php:4)
 at load_template(template.php:690)
 at locate_template(template.php:647)
 at get_template_part(general-template.php:155)
 at include(taxonomy.php:17)
 at require_once(template-loader.php:74)
 at require(wp-blog-header.php:19)
 at (main)(index.php:17)