Error when updating to WordPress 4.5.2

We have installed this Plugin here: https://www.ekosamt.se/
Worked fine until we installed to WordPress 4.5.2

Get this HTTP 500 Error when trying to reach Prisjakt and Pricerunner
https://www.ekosamt.se/?pricefile=prisjakt
https://www.ekosamt.se/?pricefile=pricerunner

Can someone help us out here ?

Thanks

/Sven-Erik

https://wordpress.org/plugins/woocommerce-pricefiles/