Fatal error: Uncaught Error: Call to undefined function is_shop() in /wp-content/themes/minimal-grid/inc/template-tags.php:228 Stack trace: #0 /wp-includes/class-wp-hook.php(286): minimal_grid_archive_title('Miesi\xC4\x85c: Luty ...') #1 /wp-includes/plugin.php(203): WP_Hook->apply_filters('Miesi\xC4\x85c: Luty ...', Array) #2 /wp-includes/general-template.php(1522): apply_filters('get_the_archive...', 'Miesi\xC4\x85c: Luty ...') #3 /wp-includes/general-template.php(1451): get_the_archive_title() #4 /wp-content/themes/minimal-grid/inc/hooks/inner-header.php(55): the_archive_title('<h1 class="entr...', '</h1>') #5 /wp-includes/class-wp-hook.php(286): minimal_grid_display_inner_header('') #6 /wp-includes/class-wp-hook.php(310): WP_Hook->apply_filters('', Array) #7 /wp-includes/plugin.php(453): WP_Hook->do_action(Array) #8 /wp-content/themes/minimal-grid/header.php(202): do_action('minimal_grid_in...') #9 /wp-includes/template.php(688): require_once('/wp-content/the...') #10 /wp-includes/template.php(647): load_template('//w in /wp-content/themes/minimal-grid/inc/template-tags.php on line 228