Fatal error: Uncaught Error: Call to a member function __toString() on null in /var/www/egb.pl/web/wp-content/themes/egb/lib/wgh_theme/Shortcodes/StockStatus.php:29 Stack trace: #0 /var/www/egb.pl/web/wp-includes/shortcodes.php(319): WGH\Shortcodes\StockStatus::render(Array, '', 'wgh_stock_statu...') #1 [internal function]: do_shortcode_tag(Array) #2 /var/www/egb.pl/web/wp-includes/shortcodes.php(197): preg_replace_callback('/\\[(\\[?)(wgh_st...', 'do_shortcode_ta...', '[wgh_stock_stat...') #3 /var/www/egb.pl/web/wp-includes/class-wp-hook.php(286): do_shortcode('[wgh_stock_stat...') #4 /var/www/egb.pl/web/wp-includes/plugin.php(203): WP_Hook->apply_filters('[wgh_stock_stat...', Array) #5 /var/www/egb.pl/web/wp-content/plugins/advanced-custom-fields-pro/includes/fields/class-acf-field-wysiwyg.php(490): apply_filters('acf_the_content', '[wgh_stock_stat...') #6 /var/www/egb.pl/web/wp-includes/class-wp-hook.php(286): acf_field_wysiwyg->format_value('[wgh_stock_stat...', 241, Array) #7 /var/www/egb.pl/web/wp-includes/plugin.ph in /var/www/egb.pl/web/wp-content/themes/egb/lib/wgh_theme/Shortcodes/StockStatus.php on line 29