Problem: The client is experiencing a WordPress database error indicating a duplicate entry for key 'uc_domain_name_context_md5' when editing a custom post type item in a bilingual site managed with WPML.
Solution: We resolved the issue by removing the problematic row with the value '0dde19c51f7721e38b1cae83d85e3a66' in the 'uc_domain_name_context_md5' from the 'icl_strings' table, which contained an invalid string. After clearing and disabling caches, the problem did not recur.
If this solution does not apply to your case, or if it seems outdated, we highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have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. If the problem persists, please open a new support ticket.
