100 cm Flower runner

Fatal error: Uncaught ValueError: max(): Argument #1 ($value) must contain at least one element in /home/u718091892/domains/ra-creation.com/public_html/wp-content/plugins/booking-and-rental-manager-for-woocommerce/inc/rbfw_inventory_functions.php:661 Stack trace: #0 /home/u718091892/domains/ra-creation.com/public_html/wp-content/plugins/booking-and-rental-manager-for-woocommerce/inc/rbfw_inventory_functions.php(661): max() #1 /home/u718091892/domains/ra-creation.com/public_html/wp-content/plugins/booking-and-rental-manager-for-woocommerce/templates/forms/multi-day-registration.php(717): rbfw_day_wise_sold_out_check_by_month() #2 /home/u718091892/domains/ra-creation.com/public_html/wp-content/plugins/booking-and-rental-manager-for-woocommerce/templates/single/default/multi-day.php(91): include('/home/u71809189...') #3 /home/u718091892/domains/ra-creation.com/public_html/wp-content/plugins/booking-and-rental-manager-for-woocommerce/inc/RBFW_Frontend.php(42): include('/home/u71809189...') #4 /home/u718091892/domains/ra-creation.com/public_html/wp-content/plugins/booking-and-rental-manager-for-woocommerce/templates/single/single-rbfw.php(66): RBFW_Frontend::load_template() #5 /home/u718091892/domains/ra-creation.com/public_html/wp-includes/template-loader.php(106): include('/home/u71809189...') #6 /home/u718091892/domains/ra-creation.com/public_html/wp-blog-header.php(19): require_once('/home/u71809189...') #7 /home/u718091892/domains/ra-creation.com/public_html/index.php(17): require('/home/u71809189...') #8 {main} thrown in /home/u718091892/domains/ra-creation.com/public_html/wp-content/plugins/booking-and-rental-manager-for-woocommerce/inc/rbfw_inventory_functions.php on line 661