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Problem:
You are experiencing a critical error during WPForms submission when the WPForms Multilingual plugin is active. This issue occurs even before translating the form.
Solution:
We recommend trying the solution provided in the WPML errata for issues related to WPForms. You can find the specific guidance here: WPForms Incorrect Field Labels and Email Notification Issue with Repeater Fields.

If this solution does not resolve your issue or seems irrelevant due to being outdated or not applicable to your case, we highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. Additionally, please feel free to open a new support ticket with us for further assistance at WPML Support Forum.