Fatal error: Uncaught Error: Call to undefined function is_shop() in /customers/f/4/a/crookesmagazine.com/httpd.www/wp-content/themes/minimal-grid/inc/template-tags.php:228 Stack trace: #0 /customers/f/4/a/crookesmagazine.com/httpd.www/wp-includes/class-wp-hook.php(286): minimal_grid_archive_title('Month: January ...') #1 /customers/f/4/a/crookesmagazine.com/httpd.www/wp-includes/plugin.php(203): WP_Hook->apply_filters('Month: January ...', Array) #2 /customers/f/4/a/crookesmagazine.com/httpd.www/wp-includes/general-template.php(1522): apply_filters('get_the_archive...', 'Month: January ...') #3 /customers/f/4/a/crookesmagazine.com/httpd.www/wp-includes/general-template.php(1451): get_the_archive_title() #4 /customers/f/4/a/crookesmagazine.com/httpd.www/wp-content/themes/minimal-grid/inc/hooks/inner-header.php(55): the_archive_title('