I activated the Product Per Page plugin for Woocommerce and i have this message:
Notice: Undefined index:
behaviour in /var/www/shop/wp-content/plugins/woocommerce-products-per-page/objects/wppp-dropdown.php on line 30
Notice: Undefined index:
behaviour in /var/www/shop/wp-content/plugins/woocommerce-products-per-page/objects/wppp-dropdown.php on line 32
Wordpress version: 3.9
Woocommerce version: 2.1.7
How to solve this issue?