This thread is resolved. Here is a description of the problem and solution.
Problem:
The client reported multiple PHP warnings and a WordPress database error related to the WPML String Translation plugin and database operations.
Solution:
We identified that the issues are associated with a known bug in WPML version 4.9. We recommend reverting to the previous stable versions of WPML and WPML String Translation until the issue is resolved in the upcoming 4.9.1 release. We have implemented this solution on the staging site, and it appears to resolve the errors. Please verify on your end and contact us if the problem persists or if new issues arise.
Please note that this solution might become outdated or may not apply to your specific situation. We highly recommend checking the related known issues, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. If the issue persists, please open a new support ticket.
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