Strange message related to cart session in WPML

[jan1980]

Hello there,

I'm using WordPress Multi Language (WPML) and I receive an error for secondary languages when adding a Donation to the cart.
Here's what I did:

• created a Project in German (primary language)
• translated it to English and Spanish (secondary languages)
• created static pages to show the projects, again one for each language
• ...and pasted the projects shortcodes there, targeting by project ID
• then I go to the frontend to test it, I add a quantity, and click on Add Donation in the primary language (German) and it works OK
• ...but I go to English or Spanish and this message is shown when adding a quantity and clicking on Add Donation:

Donation has been removed from your cart because it can no longer be purchased. Please contact us if you need assistance.

As far as I can see, this message appears on here in WooCommerce, and it's somehow related to cart sessions:

• https://github.com/woothemes/woocommerce/blob/master/includes/class-wc-cart.php

...what can we do to make it possible to pay donations for secondary language's projects?
Thanks for any small hint/idea you can have.