This thread is resolved. Here is a description of the problem and solution.
Problem: When I enable WPML I get this error: PHP Fatal error: Uncaught Error: Call to undefined method stdClass::is_enabled()
Solution: There is a corrupt record in the database. To solve the issue, try by manually changing the value for the wpml_language_switcher option in the wp-options table to be the same as a new WPML installation.
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