Fatal error: Uncaught TypeError: Unsupported operand types: int - string in /www/wp-content/plugins/quantities-and-units-for-woocommerce/includes/class-wcqu-validations.php:126
Stack trace:
#0 /www/wp-content/plugins/quantities-and-units-for-woocommerce/includes/class-wcqu-validations.php(31): WC_Quantities_and_Units_Quantity_Validations->validate_single_product()
#1 /www/wp-includes/class-wp-hook.php(324): WC_Quantities_and_Units_Quantity_Validations->add_to_cart_validation()
#2 /www/wp-includes/plugin.php(205): WP_Hook->apply_filters()
#3 /www/wp-content/plugins/woocommerce/includes/class-wc-form-handler.php(832): apply_filters()
#4 /www/wp-content/plugins/woocommerce/includes/class-wc-form-handler.php(806): WC_Form_Handler::add_to_cart_handler_simple()
#5 /www/wp-includes/class-wp-hook.php(324): WC_Form_Handler::add_to_cart_action()
#6 /www/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters()
#7 /www/wp-includes/plugin.php(517): WP_Hook->do_action()
#8 /www/wp-settings.php(665): do_action()
#9 /www/wp-config.php(70): require_once('...')
#10 /www/wp-load.php(50): require_once('...')
#11 /www/wp-blog-header.php(13): require_once('...')
#12 /www/index.php(18): require('...')
#13 {main}
thrown in /www/wp-content/plugins/quantities-and-units-for-woocommerce/includes/class-wcqu-validations.php on line 126
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