Fatal error: Uncaught Error: Call to a member function get_cart_contents_count() on null in /usr/www/users/stobbe/stobbe1776/wp-content/plugins/woocommerce-germanized/includes/class-wc-gzd-checkout.php:532 Stack trace: #0 /usr/www/users/stobbe/stobbe1776/wp-includes/class-wp-hook.php(324): WC_GZD_Checkout->prevent_differential_mixed_carts() #1 /usr/www/users/stobbe/stobbe1776/wp-includes/plugin.php(205): WP_Hook->apply_filters() #2 /usr/www/users/stobbe/stobbe1776/wp-content/plugins/woocommerce/includes/class-wc-form-handler.php(832): apply_filters() #3 /usr/www/users/stobbe/stobbe1776/wp-content/plugins/woocommerce/includes/class-wc-form-handler.php(806): WC_Form_Handler::add_to_cart_handler_simple() #4 /usr/www/users/stobbe/stobbe1776/wp-includes/class-wp-hook.php(324): WC_Form_Handler::add_to_cart_action() #5 /usr/www/users/stobbe/stobbe1776/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters() #6 /usr/www/users/stobbe/stobbe1776/wp-includes/plugin.php(517): WP_Hook->do_action() #7 /usr/www/users/stobbe/stobbe1776/wp-settings.php(665): do_action() #8 /usr/www/users/stobbe/stobbe1776/wp-config.php(99): require_once('/usr/www/users/...') #9 /usr/www/users/stobbe/stobbe1776/wp-load.php(50): require_once('/usr/www/users/...') #10 /usr/www/users/stobbe/stobbe1776/wp-blog-header.php(13): require_once('/usr/www/users/...') #11 /usr/www/users/stobbe/stobbe1776/index.php(17): require('/usr/www/users/...') #12 {main} thrown in /usr/www/users/stobbe/stobbe1776/wp-content/plugins/woocommerce-germanized/includes/class-wc-gzd-checkout.php on line 532