Resolved
Reported for: WPML Multilingual CMS 4.5.6
Resolved in: WPML 4.6.5
Overview of the issue
You may get a database error when adding products to the cart or a custom post type “Posts” or “Pages” is set as “not translatable”
Workaround
Please make sure the post type “Posts” or “Pages” is set as “translatable” or update WPML to its latest release