Woocommerce Products Per Page插件问题

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?

What theme do you use? I've had an another report on the Wordpress forums with the same notice. This was on the Genesis framework.

I will put out an release (probably) this weekend which will fix this.

Other than that I believe it is unusual to get an notice error on a live website, do you have WP_DEBUG on in your wp-config.php?

Anyhow stay up to date in this topic.

PS. I recommend to open an support topic in the Wordpress forums next time if you need support, I found this by coincidence :).