Reported for: WPML Multilingual CMS 126.96.36.199
Resolved in: WPML Multilingual CMS 3.6.0
The issue happens when you submit a form in the front-end and this form adds a new post.
In some circumstance, you may see the error below:
Uncaught Error: Call to a member function add_notice() on null in wp-content/plugins/sitepress-multilingual-cms/inc/wpml-private-actions.php:33
This issue will be resolved in the 3.6.0 release.
Meanwhile, you can download the CMS Beta Package 188.8.131.52-b.1, which will contain only this fix.